The patrol cap, formerly called the battle dress uniform (BDU) cap, is a visor style with a circular crown and retractable earlaps, which is the same basic design as the M-1951 cotton field cap. It was intended for wear with the temperate battle dress uniform.
The hot weather patrol cap is a visor style with a circular crown and air vents. It was intended for wear with the hot weather battle dress uniform.
The hot weather sun hat is a lightweight, soft crowned model with a quilt-stitched brim and chin strap. The hat is lined with self material.
The Enanced Hot Weather Battle Dress Uniform (EHWBDU) is made of 50 percent nylon and 50 percent cotton ripstop poplin instead of 100 percent cotton ripstop poplin of the Hot Weather Battle Dress Uniform (HWBDU).Other changes include fused collar and pocket tabs, removal of bellows on one side of the lower pocket, removal of waist tab, waist suppressed 3 inches, and removal of knee pleats.
The temperate battle dress uniform (BDU) was introduced as the Army's field and garrison uniform on 1 October 1981. The temperate BDU has a woodland camouflage pattern, infrared reflection, and reinforced elbows, knees, and seat in a 50-50 cotton-nylon fabric. The temperate BDU is part of the Army's battle dress system (BDS), which includes four camouflage subsystems allowing the Army to operate in temperate, desert, tropical, and arctic environments.
Commercial item description A-A-55294 covers the requirements for a visor style cap that is intended for wear in hot weather environments by military personnel of the Department of the Army.
Commercial item description A-A-55312 covers the requirements for a visor style cap that is intended for wear in a temperate zone environment by military personnel.
Military specification MIL-C-1911 initially covered a cap made from olive drab shade 7 cotton poplin with flannel lined earlap.
Military specification MIL-C-43468 covers wind resistant cotton poplin cloth, dyed and overprinted with the specified camouflage pattern.
Military specification MIL-C-44031 covers camouflage pattern printed, blended cotton and nylon twill cloth.
Military specification MIL-C-44034 covers blended cotton and nylon twill cloth which is dyed and overprinted with the prescribed camouflage print.
Military specification MIL-C-44048 covers camouflage pattern, single breasted combat coats.
Military specification MIL-C-44436 covers wind resistant poplin nylon/cotton cloth, dyed and overprinted with the specified camouflage pattern.
Military specification MIL-H-43577 covers hats made of cotton material.
Military specification MIL-H-44105 initially covered a hat made of cotton/nylon twill material dyed in a 6-color camouflage desert pattern and then different types of hot weather sun hats.
Military specification MIL-T-44047 covers camouflage pattern combat trousers.