The 921 Contingency Response Squadron (CRS) is a unit under the United States Air Force (USAF). Its primary role revolves around the rapid deployment and establishment of air base capabilities in support of contingency and crisis response operations worldwide. The squadron’s tasks may include constructing airfields, managing air traffic, providing logistical support, and ensuring the security of deployed forces. The 921 CRS falls under the Air Mobility Command (AMC), a major command within the USAF responsible for global mobility.