USGI Multicam Improved Hot Weather ShirtReady for hot OCP summer? Hooah! Most people are content to call this camouflage MultiCam however it is named OCP (Operational Camouflage Pattern), the current issue of multi environment US Army combat uniform. The hot weather uniform in OCP features a slightly lighter fabric and does away with extra bits that add to a combat uniforms bulk. These shirts feature no chest pockets with a different style of upper arm pockets and no bellows to the back