Additional Information This press release is neither an offer to purchase nor a solicitation of an offer to sell shares of Argon ST. Vortex Merger Sub, a wholly owned subsidiary of The Boeing Company, has not commenced the tender offer for the shares of Argon ST stock described in this release. Upon commencement of the tender offer, the Vortex Merger Sub will file with the SEC a tender offer statement on Schedule TO and related exhibits, including the offer to purchase, letter of transmittal, and other related documents. Following commencement of the tender offer, Argon ST will file with the SEC a tender offer solicitation/recommendation statement on Schedule 14D-9. These documents will contain important information about The Boeing Company, Argon ST, the transaction and other related matters. Investors and security holders are urged to read each of these documents carefully when they are available.