SPARS was the authorized nickname for the United States Coast Guard (USCG) Women's Reserve. The nickname is an acronym fashioned from the USCG's motto, "Semper Paratus"—"Always Ready" (SPAR). The Women's Reserve was established by the U.S. Congress and signed into law by President Franklin D. Roosevelt on November 23, 1942. The law authorized the USCG to accept women into its Women's Reserve as commissioned officers and at the enlisted level for the duration of World War II plus six months. Its purpose was to release male officers and enlisted men for sea duty by replacing them with women at shore stations. This same month, Dorothy C. Stratton was appointed director of the Women's Reserve and given the rank of lieutenant commander. She was later promoted to captain.

Women in the Air Force (WAF) was a program which served to bring women into limited roles in the United States Air Force. WAF was formed in 1948 when President Truman signed the Women's Armed Services Integration Act, allowing women to serve directly in the military. The WAF program ended in 1976 when women were accepted into the USAF on an equal basis with men.