The Department of Defense, through the U.S. Army Corps of Engineers (USACE) - Tulsa District, is seeking qualified architect-engineer firms to provide Master Planning Services under a $450 million Indefinite Delivery Contract (IDC). The procurement aims to solicit professional, multi-discipline A-E services primarily within military and civil boundaries across Texas, Oklahoma, Louisiana, Arkansas, and southern Kansas, in accordance with relevant regulations and guidelines. These services are crucial for effective planning and environmental management in support of military and civil projects. Interested firms, particularly those classified as small businesses, Section 8(a), HUBZone, Service-Disabled Veteran-Owned Small Business (SDVOSB), or Woman-Owned Small Business (WOSB), are encouraged to respond to this sources sought notice by the extended deadline of January 16, 2026. For further inquiries, contact Thomas Howard at thomas.howard@usace.army.mil or call 918-669-4389.