source of UPT instructor pilots for the USAF. To preserve the lineage and histories of combat units, the Air Force directed ATC to replace its four-digit flying and pilot training wings with two-digit designations. The 3510th FTW became the 12th Flying Training Wing (12 FTW) on 1 May 1972, taking on the designation of the tactical fighter wing inactivated in Vietnam the previous November. 1980s to 2010 Today, the 12 FTW provides instructor pilot training and refresher/recurrency training in the T-6A Texan II, T-38C Talon and T-1A Jayhawk. The wing also operates the T-1A in support of Specialized Undergraduate Navigator Training (SUNT), a mission it assumed following the Base Realignment and Closure (BRAC) closure of Mather AFB, California and inactivation of the 323d Flying Training Wing. SUNT trains prospective USAF Navigators/Combat Systems Officers destined for the B-52 Stratofortress, E-3 Sentry, E-8 Joint STARS, RC-135, non-PACER CRAG KC-135 Stratotanker, and C-130 Hercules variants, as well as prospective Naval Flight Officers en route to fly land-based U.S. Navy P-3C Orion, EP-3 Aries and E-6 Mercury aircraft. The 12 FTW also provides training to numerous NATO/Allied officer students via SUNT, as well as supporting Marine Corps and Coast Guard enlisted navigator training via the Marine Aerial Navigation School (MANS). The Marine Aerial Navigation School remained at Randolph until the school was decommissioned with the graduation of Class 04–01 on 31 July 2004. Advanced Electronic Warfare Officer (EWO) training is also conducted by the 12 FTW for those navigators/CSOs destined for eventual assignment as USAF EWOs. The 12 FTW also operates an additional airfield for practice approaches and touch-and-go landings approximately 12 miles east-northeast of Randolph in Seguin, Texas. Known as Randolph AFB Auxiliary Field/Seguin Field, this airfield was originally constructed with three runways in 1941. Normally unattended, the airfield has a single active 8350-ft runway and is supported by a manned runway supervisor unit (RSU) and aircraft rescue and fire fighting (ARFF) vehicles when conducting flight operations. Randolph has also completed major renovations to the Base Commissary as well as completely re-paving Harmon Drive, the main entrance to the base leading to "The Taj". Additional plans include construction of a new Base Exchange, which is managed by the Army and Air Force Exchange Service (AAFES). Merger (2010) The 12th FTW remained the host unit at Randolph AFB for nearly 38 years, until 31 January 2010, when the 502d Air Base Wing became the