Presolicitation notice from the DEPT OF DEFENSE, DEPT OF THE ARMY, W6QK ACC-APG office, for a Broad Agency Announcement. The notice is a Total Small Business Set-Aside (FAR 19.5) and is seeking proposals for the technical portfolio areas of the ESI Directorate, including Systems Integration (SI), C5I Engineering, and Readiness Engineering. The ESI Directorate's mission is to support the integration and maturing of ESI technologies onto ground and air platforms, as well as rapid prototyping for Solider-centric System Design. The BAA aims to explore innovative proposals that address the management and secure transmission of trustworthy data across the Army's network.