Exhibit 99.1

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Engility Reports Third Quarter 2018 Results

CHANTILLY, VA – October 31, 2018, Engility Holdings, Inc. (NYSE: EGL) today announced financial results for the third quarter ended September 28, 2018.

CEO Commentary

“We had a strong third quarter delivering a company record quarterly book-to-bill ratio, as well as revenue, profitability, and cash flow results that exceeded our expectations. These results give us further confidence that we will achieve organic revenue growth in 2019,” said Lynn Dugle, Chairman, President and CEO of Engility. “We look forward to our combination with SAIC to form the second largest independent technology integrator with complementary portfolios and similar cultures. We believe this merger provides compelling value for our shareholders through an improved capital structure that supports additional organic and inorganic investment, an attractive dividend, an ability to participate in the upside from cost and revenue synergies, and an enhanced competitive position.”

Third Quarter 2018 Results

Total revenue for the third quarter of 2018 was $471 million. GAAP operating income was $27 million and GAAP operating margin was 5.7%. GAAP net income attributable to Engility was $4 million, or $0.11 per diluted share, after recording $17 million of income taxes and non-core operating costs, which reduced net income by $0.46 per diluted share. Cash taxes paid in the third quarter of 2018 were $0.1 million. EBITDA was $38 million and EBITDA margin was 8.0%.

Adjusted operating income was $40 million and adjusted operating margin was 8.4%. Adjusted EBITDA was $44 million and adjusted EBITDA margin was 9.4%.

Information about the company's use of non-GAAP financial information is provided below under “Non-GAAP Measures” and in the non-GAAP reconciliation tables included herein.

Key Performance Indicators

Third Quarter 2018 Contract Awards

Fiscal Year 2018 Guidance

Based on Engility’s financial results for the first nine months of 2018 and its current outlook for the remainder of 2018, the company is reiterating its fiscal year 2018 guidance issued on August 1, 2018, excluding SAIC transaction-related expenses and the impact from certain non-cash tax adjustments.

Conference Call Information

Engility will host a conference call today, October 31, 2018, at 8:30 a.m. ET to discuss the financial results for its third quarter 2018.

Listeners may access a webcast of the live conference call from the Investor Relations section of the company's website at www.engility.com. Listeners also may access a slide presentation on the website, which summarizes the company’s third quarter 2018 results. Listeners should go to the website at least 15 minutes before the live event to download and install any necessary audio software.

Listeners also may participate in the conference call by dialing (888) 655-5029 (domestic) or (503) 343-6026 (international) and entering passcode 5578958.

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A replay will be available on the company's website approximately two hours after the conference call and continuing for one year. A telephonic replay also will be available through November 7, 2018 by dialing (855) 859-2056 (domestic) or (404) 537-3406 (international) and entering passcode 5578958.

About Engility

Engility (NYSE: EGL), a $2 billion technology leader, has thousands of employees around the world working to make a difference. Our history of delivering results for the defense, federal civilian, intelligence and space industries spans more than 60 years. We provide leading-edge solutions and services on Earth, in space and across cyber by leveraging expertise in systems engineering & integration, high performance computing, cybersecurity, readiness & training, enterprise modernization and mission operations support.  To learn more about us, please visit www.engility.com and connect with us on Facebook, LinkedIn and Twitter.

No Offer or Solicitation

This communication is for informational purposes only and not intended to and does not constitute an offer to subscribe for, buy or sell, the solicitation of an offer to subscribe for, buy or sell or an invitation to subscribe for, buy or sell any securities or the solicitation of any vote or approval in any jurisdiction pursuant to or in connection with the proposed transaction or otherwise, nor shall there be any sale, issuance or transfer of securities in any jurisdiction in contravention of applicable law. No offer of securities shall be made except by means of a prospectus meeting the requirements of Section 10 of the Securities Act of 1933, as amended, and otherwise in accordance with applicable law.

Additional Information and Where to Find It

In connection with the proposed acquisition of Engility, SAIC has filed with the SEC a registration statement on Form S-4 to register the shares of SAIC common stock to be issued in connection with the merger. The registration statement includes a preliminary joint proxy statement/prospectus, and a definitive joint proxy statement/prospectus, when it becomes available, will be sent to the shareholders of SAIC and Engility seeking their approval of the proposed transaction.

WE URGE INVESTORS AND SECURITY HOLDERS TO READ THE REGISTRATION STATEMENT ON FORM S-4, THE JOINT PROXY STATEMENT/PROSPECTUS INCLUDED WITHIN THE REGISTRATION STATEMENT ON FORM S-4 AND ANY OTHER RELEVANT DOCUMENTS FILED OR TO BE FILED WITH THE SEC IN CONNECTION WITH THE PROPOSED TRANSACTION BECAUSE THESE DOCUMENTS DO AND WILL CONTAIN IMPORTANT INFORMATION ABOUT SAIC, ENGILITY, AND THE PROPOSED TRANSACTION.

Investors and security holders may obtain copies of these documents free of charge through the website maintained by the SEC at www.sec.gov or from SAIC at its website, www.saic.com, or from Engility at its website, www.engility.com.

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Participants in Solicitation

SAIC, Engility, and their respective directors, executive officers, and other employees may be deemed to be participants in the solicitation of proxies from the stockholders of SAIC and Engility in connection with the proposed transaction. Information about SAIC’s executive officers and directors is set forth in its Annual Report on Form 10-K, which was filed with the SEC on March 29, 2018 and its proxy statement for its 2018 annual meeting of stockholders, which was filed with the SEC on April 25, 2018. Information about Engility’s executive officers and directors is set forth in its Annual Report on Form 10-K, which was filed with the SEC on March 2, 2018, and the proxy statement for its 2018 annual meeting of stockholders, which was filed with the SEC on April 13, 2018. Investors may obtain more detailed information regarding the direct and indirect interests of SAIC, Engility, and their respective executive officers and directors in the transaction by reading the preliminary and definitive joint proxy statement/prospectus regarding the transaction, which will be filed with the SEC.

Forward-Looking Statements

This press release contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995, including statements regarding Engility’s future prospects, projected financial results, estimated integration costs and acquisition related amortization expenses, the proposed transaction between SAIC and Engility, and business plans. Words such as "may," "will," "should," "likely," "anticipates," "expects," "intends," "plans," "projects," "believes," "estimates" and similar expressions are also used to identify these forward-looking statements. These statements are based on the current beliefs and expectations of Engility’s management and are subject to significant risks and uncertainties. Actual results may differ from those set forth in the forward-looking statements. Factors that could cause Engility’s actual results to differ materially from those described in the forward-looking statements can be found under the heading "Risk Factors" included in our Annual Report on Form 10-K for the year ended December 31, 2017, and more recent documents that have been filed with the Securities and Exchange Commission (SEC) and are available on the investor relations section of Engility’s website (www.engility.com) and on the SEC’s website (www.sec.gov).  In addition, there are various risks and uncertainties associated with the proposed transaction between SAIC and Engility, including but not limited to, the occurrence of any event, change or other circumstances that could delay the closing of the pending merger; the possibility of non-consummation of the pending merger and termination of the merger agreement; the risk that the Company could be required to pay a termination fee of up to $60 million to SAIC under certain circumstances pursuant to the terms of the merger agreement; the failure to obtain Company stockholder approval of the pending merger or to satisfy any of the other conditions to the merger agreement; the possibility that a governmental entity may prohibit, delay or refuse to grant a necessary regulatory approval in connection with the pending merger; the risk that stockholder litigation in connection with the pending merger may affect the timing or occurrence of the pending merger or result in significant costs of defense, indemnification

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and liability; the significant transaction costs which have been and may continue to be incurred by the Company related to the pending merger; and other potential risks to the Company associated with any failure to closing the merger, including the potential distraction of employee and management attention during the pendency of the merger, uncertainty about the effect of the pending merger on the Company’s relationships with employees, potential and existing customers and suppliers and other parties, and the impact that the failure of the pending merger to close could have on the trading price of shares of Company common stock and the Company’s operating results. Forward-looking statements are made only as of the date hereof, and we undertake no obligation to update or revise the forward-looking statements, whether as a result of new information, future events or otherwise, except as required by law. In addition, historical information should not be considered as an indicator of future performance.

ENGILITY HOLDINGS, INC.

UNAUDITED CONSOLIDATED STATEMENTS OF OPERATIONS

(in thousands, except per share data)

ENGILITY HOLDINGS, INC.

UNAUDITED CONSOLIDATED BALANCE SHEETS

(in thousands)

ENGILITY HOLDINGS, INC.

UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS

(in thousands)

Non-GAAP Measures

The tables under "Engility Holdings, Inc. Reconciliation of Non-GAAP Measures" present Adjusted Operating Income, Adjusted Operating Margin, Earnings before Interest, Taxes, Depreciation, and Amortization (“EBITDA”), Adjusted EBITDA, EBITDA Margin, and Adjusted EBITDA Margin, reconciled to their most directly comparable GAAP measure. These financial measures are calculated and presented on the basis of methodologies other than in accordance with U.S. generally accepted accounting principles ("Non-GAAP Measures"). Engility has provided these Non-GAAP Measures to adjust for, among other things, the transaction costs related to the SAIC Merger, the impact of amortization expenses related to our acquisitions of TASC, Inc. and Dynamics Research Corporation, costs associated with a loss or gain on the disposal or sale of property, plant and equipment, restructuring and related expenses, legal and settlement costs, and refinancing-related expenses. These items have been adjusted because they are not considered core to the company’s business or otherwise not considered operational or because these charges are non-cash or non-recurring. The company presents these Non-GAAP Measures because management believes that they are meaningful to understanding Engility’s performance during the periods presented and the company’s ongoing business. Non-GAAP Measures are not prepared in accordance with GAAP and therefore are not necessarily comparable to similarly titled metrics or the financial results of other companies. These Non-GAAP Measures should be considered a supplement to, not a substitute for, or superior to, the corresponding financial measures calculated in accordance with GAAP.

ENGILITY HOLDINGS, INC.

RECONCILIATION OF NON-GAAP MEASURES

The following tables set forth a reconciliation of each of these Non-GAAP Measures to the most directly comparable GAAP measure for the periods presented.

Adjusted Operating Income and Adjusted Operating Margin

(dollars in thousands)

ENGILITY HOLDINGS, INC.

Earnings before interest, taxes, depreciation, and amortization (EBITDA) and Adjusted EBITDA

(dollars in thousands)