The USGI Massif OCP Fire Resistant Combat Shirt (FR ACS) is the standard issue combat shirt for U.S. Army and Air Force personnel, with over five million fielded since its introduction. Engineered for maximum performance in demanding environments, this shirt is flame-resistant, lightweight, and optimized for wear beneath body armor. Its torso is constructed from highly breathable, moisture-wicking, four-way stretch fabric that keeps soldiers cool and comfortable during intense operations, while the sleeves are built from durable flame-resistant material for protection against abrasion and flash threats.
 
Designed with direct input from service members, the ACS incorporates functional features such as low-profile zippered sleeve pockets, loop fields for patches, reinforced elbows, and seamless side panels to reduce chafing under load. This proven design has become the benchmark for hot-weather combat gear. Proudly made in the USA and fully Berry Compliant, it is issued in OCP Scorpion camouflage to match current U.S. military uniforms.