The MEU(SOC), officially designated the M45 MEUSOC, is a semi-automatic pistol manufactured by Colt's Manufacturing company that chambers the .45 ACP round. The weapon is based on the original M1911 design. The M45MEU (SOC) is categorized as a handgun in the Rainbow Six universe. The M45MEU (SOC) appears in Tom Clancy's Rainbow Six: Lockdown and Tom Clancy's Rainbow Six Siege.