officers wore red piping and Marine generals wore gold piping with all ranks wearing the Eagle, Globe, and Anchor insignia on the wearer's left side. The cover was made in both forest green wool and khaki cotton. Usage continues to be common in the U.S. Marine Corps as the most common headgear when wearing service uniforms (the other option being the bulkier frame-type "barracks cover"). In addition, it is the standard headgear for Marine aviators, flight officers, and enlisted aircrew wearing flight suits. The Marine officer's garrison cap, unlike those of the Army or Air Force, does not have metallic piping; the only items distinguishing it from the enlisted cap is the placement of small officer's rank insignia on the right side of the cap and the style of the Eagle, Globe and Anchor insignia on the left. U.S. Navy In the U.S. Navy the garrison cap ("cover") was first authorized during World War II, originally for aviators and later for all officers and chief petty officers (CPOs). Blue and white versions, as well as a forest green version for aviation officers and CPOs were later developed, although the blue and white versions were discontinued after the war. Today, garrison caps in khaki are almost always worn with service khakis and flight suits. Officers wear a miniature version of the officer crest on the left and small rank insignia on the right side of the cap, while CPOs will wear a CPO, SCPO or MCPO fouled anchor on the left as appropriate. Like the Marine Corps, and in contrast to their Army and Air Force counterparts, the Navy caps for officers also avoid the use of metallic piping. The blue version garrison cap, essentially black, was resurrected in the mid-1990s for wear with the blue working uniforms. Enlisted personnel since 2008 have been issued a black garrison cap for wear with the new Navy Service Uniform. It has since been authorized for the officer and CPO Service Dress Blue uniforms. The garrison cap is also worn by midshipmen and officer candidates. U.S. Coast Guard The U.S. Coast Guard issues the garrison cap ("cover") to all service members. The cap is serge and is authorized with Tropical Blue, the Winter Dress Blue, and Service Dress Blue uniform. Regulations for the placement of insignia are similar those of the U.S. Navy and Marine Corps. Unlike the Navy, enlisted members in the rates