In 1974, under the "Total Force Policy", Guard and Reserve units began to receive newer aircraft and equipment in the 1970s. The 166th TFS began conversion to the A-7D Corsair II in December which brought with it additional missions. The 178th TFG received the A-7D in January 1978. The conversion from the F-100 to the A-7 was accomplished in less than three months, the fastest ever for an Air Force or Air National Guard unit. The 179th TFG converted to A-7D in the summer of 1979