Power of Attorney for Troy Lahr

This filing details a Power of Attorney granted by Troy Lahr, EVP & Chief Financial Officer of Booz Allen Hamilton Holding Corporation, to Jamie Weatherby. The authorization allows Weatherby, acting as an attorney-in-fact, to execute and file Forms 3, 4, and 5 on behalf of Lahr, in compliance with Section 16(a) of the Securities Exchange Act of 1934. This delegation is necessary for reporting ownership and transactions of Booz Allen Hamilton Holding Corporation securities. The power of attorney remains effective until Lahr is no longer required to file these forms or until it is revoked. The filing also indicates that Troy Lahr currently holds 0 shares of Class A Common Stock directly following this transaction.