Exhibit 99.1

UNAUDITED PRO FORMA CONDENSED COMBINED FINANCIAL STATEMENTS

On May 29, 2015, Harris Corporation (“Harris”) completed its acquisition of Exelis Inc. (“Exelis”) pursuant to the Agreement and Plan of Merger (the “Merger Agreement”), dated February 5, 2015, among Harris, Exelis, and a wholly owned subsidiary of Harris (“Merger Sub”). At the closing of the acquisition, Merger Sub merged with and into Exelis, with Exelis continuing as the surviving corporation and a wholly owned subsidiary of Harris (the “Merger”). Exelis shareholders received, in exchange for each share of Exelis common stock they owned, (1) $16.625 in cash, without interest, and (2) 0.1025 shares of Harris common stock. Harris paid approximately $3.2 billion in cash (net of $130 million of Exelis cash on May 29, 2015) and issued approximately 19.3 million shares of its common stock in consideration for the Merger. Harris funded the cash consideration and other amounts payable under the terms of the Merger Agreement from a combination of (1) cash on hand; (2) borrowings under a new senior unsecured term loan facility in an aggregate principal amount of $1.3 billion (the “New Term Loan”); and (3) a portion of the proceeds from $2.4 billion in debt securities which Harris issued on April 27, 2015 and which consisted of $500,000,000 aggregate principal amount of its 1.999% Notes due 2018 (the “2018 Notes”), $400,000,000 aggregate principal amount of its 2.700% Notes due 2020 (the “2020 Notes”), $600,000,000 aggregate principal amount of its 3.832% Notes due 2025 (the “2025 Notes”), $400,000,000 aggregate principal amount of its 4.854% Notes due 2035 (the “2035 Notes”) and $500,000,000 aggregate principal amount of its 5.054% Notes due 2045 (the “2045 Notes” and together with the 2018 Notes, 2020 Notes, 2025 Notes and 2035 Notes, the “Notes”). In addition, Harris redeemed $750,000,000 aggregate principal amount of its existing notes with a portion of the proceeds from the Notes.

The following unaudited pro forma condensed combined financial statements give effect to the Merger under the acquisition method of accounting in accordance with Financial Accounting Standards Board (“FASB”) Accounting Standard Codification Topic 805, Business Combinations (“ASC Topic 805”), with Harris treated as the legal and accounting acquirer. The historical consolidated financial information in the unaudited pro forma condensed combined financial statements has been adjusted to give effect to pro forma events that are (1) directly attributable to the Merger, (2) factually supportable, and (3) with respect to the statements of income, expected to have a continuing impact on the combined results of Harris and Exelis. The unaudited pro forma condensed combined balance sheet as of April 3, 2015 is based on the individual historical consolidated balance sheets of Harris and Exelis, and has been prepared to reflect the Merger as if it occurred on April 3, 2015, which was the end of Harris’ third quarter of fiscal 2015. The unaudited pro forma condensed combined statements of income for the three quarters ended April 3, 2015 and the year ended June 27, 2014 combine the historical results of operations of Harris and Exelis, and have been prepared to reflect the Merger as if it occurred on June 29, 2013, the first day of Harris’ fiscal 2014.

Harris’ fiscal year ends on the Friday nearest June 30, and prior to the Merger, Exelis’ fiscal year ended on December 31. As a consequence of those different fiscal years:

On September 27, 2014, Exelis completed its previously announced spin-off of Vectrus, Inc. (formerly referred to as Mission Systems) (“Vectrus”), and Exelis reported Vectrus as discontinued operations beginning in the fourth quarter of its fiscal year ended December 31, 2014. Consequently, the unaudited pro forma condensed combined statements of income for the three quarters ended April 3, 2015 and the year ended June 27, 2014 reflect separately the historical results of operations for (1) Exelis (as previously reported by Exelis, including Vectrus’ results of operations), (2) Vectrus and (3) Exelis (as adjusted to exclude Vectrus’ results of operations). The unaudited pro forma condensed combined balance sheet as of April 3, 2015 reflects the historical unaudited consolidated balance sheet of Exelis as of March 31, 2015, which excludes Vectrus.

The unaudited pro forma condensed combined statements of income do not reflect events that may have occurred after the Merger or still may occur in the future, including, but not limited to, the anticipated realization of ongoing savings from operating synergies; and certain one-time charges Harris incurred or still expects to incur in connection with the transaction, including, but not limited to, costs in connection with integrating the operations of Harris and Exelis.

The following unaudited pro forma condensed combined financial statements are for informational purposes only and do not purport to indicate the results that actually would have been obtained had the Merger been completed on the assumed dates or for the periods presented, or which may be realized in the future. To prepare the unaudited pro forma condensed combined financial statements, Harris adjusted Exelis’ assets and liabilities to their estimated fair values based on preliminary valuation work. As of the date of filing of the Current Report on Form 8-K/A to which the following unaudited pro forma condensed combined financial statements are attached, Harris has not completed the detailed valuation work necessary to finalize the required estimated fair values of the Exelis assets acquired and liabilities assumed and the related allocation of purchase price, nor has Harris identified all adjustments necessary to conform Exelis’ accounting policies to Harris’ accounting policies. However, during preparation of the accompanying unaudited pro forma condensed combined financial statements, Harris performed an analysis and identified no material differences in accounting policies between Harris and Exelis. A preliminary determination of the fair value of Exelis’ assets and liabilities was based on the actual net tangible and intangible assets and liabilities of Exelis that existed as of May 29, 2015, the date the Merger was completed. Additionally, the value of the portion of the per share Merger consideration that was paid in shares of Harris common stock was determined based on the closing price of Harris common stock on the New York Stock Exchange on May 29, 2015, the date the Merger was completed. The purchase price allocation included in the unaudited pro forma condensed combined financial statements is preliminary and is subject to further adjustments as additional information becomes available and as additional analyses are performed. Further, the preliminary purchase price allocation has been made solely for the purpose of preparing the unaudited pro forma condensed combined financial statements. The preliminary purchase price allocation was based on reviews of publicly disclosed allocations for other acquisitions in the industry, Harris’ historical experience, data that was available through the public domain, Harris’ due diligence review of Exelis’ business and, following completion of the Merger, incremental valuation work that was performed. Any increases or decreases in the fair value of relevant statement of financial position amounts will result in adjustments to the statement of financial position and/or statements of income until the purchase price allocation is finalized. There can be no assurance that such finalization will not result in material changes from the preliminary purchase price allocation included in the unaudited pro forma condensed combined financial statements.

The following unaudited pro forma condensed combined financial statements should be read in conjunction with:

Unaudited Pro Forma Condensed Combined Balance Sheet

As of April 3, 2015

(In millions)

See accompanying Notes to Unaudited Pro Forma Condensed Combined Financial Statements.

Unaudited Pro Forma Condensed Combined Statement of Income For the Three Quarters Ended April 3, 2015 (In millions, except per share amounts)

See accompanying Notes to Unaudited Pro Forma Condensed Combined Financial Statements.

Unaudited Pro Forma Condensed Combined Statement of Income

For the Fiscal Year Ended June 27, 2014

(In millions, except per share amounts)

See accompanying Notes to Unaudited Pro Forma Condensed Combined Financial Statements.

NOTES TO UNAUDITED PRO FORMA CONDENSED COMBINED FINANCIAL STATEMENTS

NOTE 1: Description of Transaction and Basis of Presentation

On May 29, 2015, Harris completed its acquisition of Exelis pursuant to the Merger Agreement. At the closing of the Merger, Merger Sub merged with and into Exelis, with Exelis continuing as the surviving corporation and a wholly owned subsidiary of Harris. Exelis shareholders received, in exchange for each share of Exelis common stock they owned, (1) $16.625 in cash, without interest, and (2) 0.1025 shares of Harris common stock.

Harris paid approximately $3.2 billion in cash (net of $130 million of Exelis cash on May 29, 2015) and issued approximately 19.3 million shares of its common stock in consideration for the Merger. Harris funded the cash consideration and other amounts payable under the terms of the Merger Agreement from a combination of cash on hand, borrowings under the New Term Loan, and a portion of the proceeds from the issuance of $2.4 billion in Notes. In addition, Harris redeemed $750 million aggregate principal amount of its existing notes with a portion of the proceeds from the Notes.

The accompanying unaudited pro forma condensed combined financial statements give effect to the Merger under the acquisition method of accounting in accordance with ASC Topic 805, Business Combinations, with Harris treated as the legal and accounting acquirer. The historical consolidated financial information in the unaudited pro forma condensed combined financial statements has been adjusted to give effect to pro forma events that are (1) directly attributable to the Merger, (2) factually supportable, and (3) with respect to the statements of income, expected to have a continuing impact on the combined results of Harris and Exelis. The unaudited pro forma condensed combined balance sheet as of April 3, 2015 is based on the individual historical consolidated balance sheets of Harris and Exelis, and has been prepared to reflect the Merger as if it occurred on April 3, 2015, which was the end of Harris’ third quarter of fiscal 2015. The unaudited pro forma condensed combined statements of income for the three quarters ended April 3, 2015 and the year ended June 27, 2014 combine the historical results of operations of Harris and Exelis, and have been prepared to reflect the Merger as if it occurred on June 29, 2013, the first day of Harris’ fiscal 2014.

The accompanying unaudited pro forma condensed combined statements of income do not reflect events that may have occurred after the Merger or still may occur in the future, including, but not limited to, the anticipated realization of ongoing savings from operating synergies, and certain one-time charges Harris incurred or still expects to incur in connection with the transaction, including, but not limited to, costs in connection with integrating the operations of Harris and Exelis. The accompanying unaudited pro forma condensed combined financial statements are for informational purposes only and do not purport to indicate the results that actually would have been obtained had the Merger been completed on the assumed dates or for the periods presented, or which may be realized in the future.

To prepare the accompanying unaudited pro forma condensed combined financial statements, Harris adjusted Exelis’ assets and liabilities to their estimated fair values based on preliminary valuation work. As of the date of filing of the Current Report on Form 8-K/A to which the accompanying unaudited pro forma condensed combined financial statements are attached, Harris has not completed the detailed valuation work necessary to finalize the required estimated fair values of the Exelis assets acquired and liabilities assumed and the related allocation of purchase price.

Also, as of the date of filing of the Current Report on Form 8-K/A to which the accompanying unaudited pro forma condensed combined financial statements are attached, Harris has not identified all adjustments necessary to conform Exelis’ accounting policies to Harris’ accounting policies. However, during preparation of the accompanying unaudited pro forma condensed combined financial statements, Harris has performed an analysis and identified no material differences in accounting policies between Harris and Exelis.

Additionally, the value of the portion of the per share Merger consideration that was paid in shares of Harris common stock was determined based on the closing price of Harris common stock on the New York Stock Exchange on May 29, 2015, the date the Merger was completed. However, the purchase price allocation included in the accompanying unaudited pro forma condensed combined financial statements is preliminary and is subject to further adjustments as additional information becomes available and as additional analyses are performed.

NOTE 2: Preliminary Consideration Transferred and Preliminary Fair Value of Net Assets Acquired

The unaudited pro forma condensed combined balance sheet has been adjusted to reflect the estimated fair values of the Exelis’ identifiable assets acquired and liabilities assumed, and the excess of the consideration over these fair values is recorded to goodwill.

The preliminary purchase price allocation was based on reviews of publicly disclosed allocations for other acquisitions in the industry, Harris’ historical experience, data that was available through the public domain and Harris’ due diligence review of Exelis’ business, and incremental valuation work performed following completion of the Merger. Any increases or decreases in the fair value of relevant statement of financial position amounts based on completion of an appraisal of tangible assets acquired and liabilities assumed and final valuation of intangible assets will result in adjustments to the statement of financial position and/or statements of income until the purchase price allocation is finalized. The consideration transferred and preliminary fair value of Exelis’ assets acquired and liabilities assumed as if the Merger occurred on April 3, 2015 is presented as follows:

Additional adjustments in the unaudited pro forma condensed combined balance sheet include $48 million ($37 million after-tax) in acquisition-related costs, including fees paid in connection with a new bridge term loan facility that was terminated, as a reduction in cash with a corresponding decrease to Retained Earnings ($28 million) and Other Capital ($9 million) reflecting the mix of cash and equity consideration to be paid.

NOTE 3: Pro Forma Adjustments

The unaudited pro forma condensed combined balance sheet as of April 3, 2015 has been adjusted to reflect the actual financing costs paid. Accordingly, approximately $29 million of financing costs were recorded in the unaudited pro forma condensed combined balance sheet ($3 million in Other Current Assets, $22 million in Other Non-current Assets, $1 million as a discount on Current Portion of Long-term Debt and $3 million as a discount on Long-term Debt). Additionally, $130 million of borrowings under the New Term Loan are reflected in Current Portion of Long-term Debt to reflect quarterly principal amortization payments equal to 2.50 percent of the initial principal amount of the New Term Loan for each tranche.

The unaudited pro forma condensed combined statements of income for the three quarters ended April 3, 2015 and the year ended June 27, 2014 have been adjusted to reflect the Merger as if it occurred on June 29, 2013, the first day of Harris’ fiscal 2014. In connection with obtaining the committed debt financing on such date, approximately $29 million of financing costs were recognized over the life of the underlying debt. This amortization is recorded as interest expense and resulted in charges of approximately $3 million for the three quarters ended April 3, 2015 and approximately $5 million for the year ended June 27, 2014.

In connection with the redemption of the Harris notes described above, the unaudited pro forma condensed combined balance sheet as of April 3, 2015 reflects a $73 million decrease in Retained Earnings representing the after-tax loss on a $118 million pre-tax loss on extinguishment of this debt. The $118 million pre-tax loss consists of $113 million of “make-whole” redemption prices paid and a write-off of $5 million of unamortized debt issue costs related to these notes. As a result of the redemption of the Harris notes, the unaudited pro forma condensed combined balance sheet as of April 3, 2015 reflects a net decrease to Cash and Cash Equivalents of $68 million (reflecting the $113 million of make-whole redemption prices paid, net of a $45 million tax benefit on the $118 million net loss on extinguishment of this debt). Additionally, in connection with the redemption of the Harris notes described above, the unaudited pro forma condensed combined balance sheet as of April 3, 2015 reflects (i) a $13 million decrease in Retained Earnings representing the after-tax amount related to accrued but unpaid interest of $22 million on these notes and (ii) a $31 million decrease in Cash and Cash Equivalents, a $39 million decrease in Other Accrued Items, a $5 million decrease in Accumulated Other Comprehensive Loss and an $3 million decrease in Non-current Deferred Income Taxes related to the termination of four interest rate swap agreements previously put in place to hedge against interest-rate risk associated with our issuance of the new debt securities.

A 0.125 percent variance in the variable interest rate for the term loans would change interest expense for the three quarters ended April 3, 2015 and for the year ended June 27, 2014 by approximately $1.1 million and $1.6 million, respectively.