513th ACG STEP II Promotion Selects Published Sept. 8, 2023 By Master Sgt. Lauren Kelly 513th Air Control Group Public Affairs TINKER AIR FORCE BASE, Okla. -- STEP II promotion selectees from the 513th Air Control Group enlisted ranks are: MASTER SERGEANT Curtis Clowdus, 970th Airborne Air Control Squadron Raquel Miller, 970th Airborne Air Control Squadron