Exhibit 10.5

NO OF PAGES: 6 (Excluding Cover)

JPMorgan Chase Bank, N.A.

270 Park Avenue

New York

NY 10017

USA

11 April 2017

Amendment of a Rate Swap Transaction

This Confirmation represents an amendment and restatement of any prior documents or other confirming communications between the parties with respect to the Transaction.

The purpose of this letter (this “Confirmation”) is to confirm the terms and conditions of the Swap Transaction entered into between: JPMorgan Chase Bank, N.A. (“JPMorgan”) and BOOZ ALLEN HAMILTON INC. (the “Counterparty”) on the Trade Date and identified by the JPMorgan Deal Number specified below (the “Transaction”). This letter agreement constitutes a “Confirmation” as referred to in the Master Agreement specified below, and supersedes any previous confirmation or other writing with respect to the transaction described below.

The definitions and provisions contained in the 2006 ISDA Definitions (the “Definitions”), as published by the International Swaps and Derivatives Association, Inc. are incorporated into this Confirmation. In the event of any inconsistency between those definitions and provisions and this Confirmation, this Confirmation will govern.

This Confirmation supplements, forms part of, and is subject to, the ISDA Master Agreement dated as of 17 December 2014, as amended and supplemented from time to time (the “Agreement”), between JPMorgan and the Counterparty. All provisions contained in the Agreement govern this Confirmation except as expressly modified below.

The terms of the particular Swap Transaction to which this Confirmation relates are as follows:

TRANSACTION DETAILS

DOCUMENTS TO BE DELIVERED

Each party shall deliver to the other, at the time of its execution of this Confirmation, evidence of the incumbency and specimen signature of the person(s) executing this Confirmation, unless such evidence has been previously supplied and remains true and in effect.

RELATIONSHIP BETWEEN PARTIES

Each party will be deemed to represent to the other party on the date on which it enters into a Transaction that (absent a written agreement between the parties that expressly imposes affirmative obligations to the contrary for that Transaction):

(a) Non-Reliance. It is acting for its own account, and it has made its own independent decisions to enter into that Transaction and as to whether that Transaction is appropriate or proper for it based upon its own judgment and upon advice from such advisers as it has deemed necessary. It is not relying on any communication (written or oral) of the other party as investment advice or as a recommendation to

enter into that Transaction. it being understood that information and explanations related to the terms and conditions of a Transaction shall not be considered investment advice or a recommendation to enter into that Transaction. No communication (written or oral) received from the other party shall be deemed to be an assurance or guarantee as to the expected results of that Transaction.

(b) Assessment and Understanding. It is capable of assessing the merits of and understanding (on its own behalf or through independent professional advice), and understands and accepts, the terms, conditions and risks of that Transaction. It is capable of assuming, and assumes the risks of that Transaction.

(c) Status of Parties. The other party is not acting as a fiduciary for or an adviser to it in respect of that Transaction.

TIME OF DEALING

The time of dealing will be confirmed by JPMorgan upon written request.

Please confirm that the foregoing correctly sets forth the terms of our agreement by executing a copy of this Confirmation and returning it to us or by sending to us a letter, telex or facsimile substantially similar to this letter, which letter, telex or facsimile sets forth the material terms of the Transaction to which this Confirmation relates and indicates agreement to those terms. When referring to this Confirmation, please indicate: JPMorgan Deal Number(s): 2000005367897

On Behalf of JPMorgan Chase Bank, N.A.

Client Service Group

All queries regarding confirmations should be sent to:

JPMorgan Chase Bank, N.A.

Contacts

Please quote the JPMorgan deal number(s): 2000005367897