Originally established in August 1942 at Columbia AAB, S.C., the unit was designated the 340th Bombardment Group (Medium). The group flew B-25s, engaging chiefly in support and interdiction missions. The 340th participated in the reduction of Pantelleria and Lampedusa in June 1943, the bombing of German evacuation beaches near Messina in July, the establishment of the Salerno beachhead in September, the drive for Rome during January to June 1944, the invasion of Southern France in August, and attacks on the Brenner Pass and other German lines of communication in Northern Italy from September 1944 to April 1945. Shortly thereafter, the B-25s and aircrew were back in the US. and the unit deactivated in November 1945. The unit was reactivated and continued performing medium bombardment training in the Air Force Reserve from October 1947 to August 1949 at Tulsa Municipal Airport, Okla. 

The 340th Bombardment Group was again reactivated in May 1968 at Carswell AFB, TX. In June 1977, it was redesignated as the 340th Air Refueling Group (Heavy) and moved in July 1977 to Altus AFB, OK. It was redesignated the 340th Air Refueling Wing (Heavy) in October 1984 and reassigned to Fifteenth Air Force, Strategic Air Command in June 1988 with subsequent redesignation as the 340th Air Refueling Wing on 1 September 1991. It was reassigned to Air Mobility Command on June 1, 1992, and inactivated on October 1, 1992. 

The 340th is now reactivated at Randolph AFB, Texas, as the 340th Flying
Training Group, organized to provide associate instructor pilots for the
AETC SUPT mission. The Group consists of a headquarters element at Randolph
AFB, six associate Reserve flying training squadrons, and a Basic Military Training squadron: the 5th FTS at Vance AFB, OK, the 39th FTS at Randolph,
AFB, TX, the 43rd FTS at Columbus AFB, MS, the 70th Flight Training Squadron at the U.S. Air Force Academy, Colo., the 96th FTS at Laughlin AFB, Texas, the 97th FTS at Sheppard AFB, Texas, and the 433rd TRS at JBSA Lackland, Texas.

The 340th has a number of decorations including eleven campaign streamers, two distinguished unit citations, and four outstanding unit awards


 T-1A Jayhawk

 T-38C Talon and AT-38

 T-6A Texan II