The 373d Strategic Missile Squadron (373 SMS) is an inactive United States Air Force unit. It was last assigned to the 308th Strategic Missile Wing, stationed at Little Rock AFB, South Dakota. The 373 SMS was equipped with the LGM-25C Titan II Intercontinental ballistic missile (ICBM), with a mission of nuclear deterrence. The squadron was inactivated as part of the phaseout of the Titan II ICBM on 18 August 1987.