U.S. Army uniform regulations do not provide wear guidance regarding clear, plastic rain covers for the Drill Sergeant Hat, also referred to as a “Campaign Hat” or colloquially as a “Round Brown” (World War II regulations called them “Service Hats”). All that is said regarding plastic rain-cap covers is that (1) they are an optional purchase item, (2) they must completely cover the crown and visor, and (3) males may wear them with the the Heritage Green or Army Blue Service Caps.
Discontinued following the conclusion of World War II, Drill Sergeant Hats were brought back after the Army introduced Drill Sergeants in pilot programs held at Fort Gordon, Georgia (redesignated Fort Eisenhower in October 2023) and Fort Jackson, South Carolina in 1963 and then implemented Drill Sergeants service-wide. Drill Sergeants trained recruits during the first and second phases of their training, Basic Combat Training (“boot camp”) and Advanced Individual Training (AIT), as well as at One Station Unit Training (the two phases combined). The Army replaced AIT Drill Sergeants with Platoon Sergeants in 2008, but a decade later reversed the decision.