The 1975 Giant Voice competition was canceled by CINCSAC General Dougherty and replaced with a military exercise named Operation High Noon. Operation High Noon served as a transition phase while SAC redesigned the Giant Voice competition.

SAC bombers, fighter-bombers and aerial refueling tankers, F-111s of Tactical Air Command and "Vulcan" bombers of the Royal Air force completed the two-day nationwide exercise to evaluate the capability of the participating units to plan and execute contingency operations with minimum preparation time. Mission objectives included evaluation of new concepts, tactics and procedures that were applicable to rapid response situations. Beside SAC units, the exercise also involved three F-111 wings from TAC and four "Vulcan" crews from the United Kingdom's RAF Strike Command, operating from Barksdale AFB, Louisiana.

SAC units were notified on Saturday, September 27, 1975 to select their respective aircrews and aircraft from those which were on alert duty and to begin mission planning and preparation. The Royal Air Force and Tactical Air Command commanders also employed a random selection procedure for their crews and aircraft. Exercise missions were flown in two night segments, September 30 - October 1 and, October 1 - October 2. The Strategic Air Command normally maintained up to 30 percent of its bomber and tanker force on 24 hours ground alert; therefore, other aircrews replaced those selected to participate in this exercise and there was no alert degradation.

All 21 SAC bomber and three tanker wings plus two non-collocated tanker squadrons within the continental United States were participating. Each SAC Bomb Wing flew two bombers (B-52s and FB-111s) and two KC-135 tanker aircraft while each SAC Tanker Wing and non-collocated squadrons flew two KC-135s. Each of the three TAC F-111 Fighter Wings also employed two aircraft. With the exception of the RAF, all aircraft took off from and landed at their home bases, and performed en route aerial refueling as part of the exercise. The RAF Strike Command had prepositioned four "Vulcan" bombers at Barksdale AFB and operated from there. Each aircrew flew one mission during the two days exercise. The aircraft and crew were scored on all aspects of mission reliability, including their accuracy and proficiency in navigation controlled timing, and, with the exception of the RAF, aerial refueling. The bombers and fighters were also scored on multiple low level bomb runs. No bombs were carried by these aircraft; all bombing was simulated and radar scored through aircrew transmission of electrical impulses recorded by ground based scoring (RBS) equipment, using radio and radar signals to measure the accuracy of these simulated bomb drops.

Operation High Noon gave participating commands a useful means of evaluating and determining the capabilities of their respective unit staffs, aircrews and supporting personnel to respond rapidly to potential contingency situations.

SAC's 92nd Bomb Wing at Fairchild AFB, Washington, achieved the best overall results of any SAC's bomber and tanker units participating in the High Noon exercise. The Fairchild unit was the outstanding SAC unit based on its combined best scores in overall bombing and tanker operations. It also posted the best individual B-52 mission and the best KC-135 mission.

The best bombing unit was achieved by the two F-111 crews of TAC's 366th TFW at Mountain Home, Idaho. These F-111s were supported in the mission by KC-135s of SAC's 916th AREFS based at Travis AFB, California. The best overall unit navigation results were posted by the B-52s and KC-135s of the 5th Bomb Wing at Minot AFB, N.D.

The crew of SAC's 380th Bomb Wing at Plattsburgh AFB, N.Y., achieved the best individual bombing results during the exercise and crew number four of the Royal Air Force's Strike Command achieved the best overall results of any of the RAF's "Vulcan" crews participating. The best '111' mission was flown by Capt. Bob Muldrow, pilot and Maj. Paul Bragdon, navigator from the 528th Bomb Squadron. Crew chiefs for the aircraft were Sgt. Randall J. Runia and Sgt. James W. Swinfort from the 380th OMS.

In the various categories of aircraft that participated in this mission, crews of the following units posted the best results in scored events: Individual B-52 Mission. 1- 92nd Bomb Wing, Fairchild AFB, Washington. 2- 2nd Bomb Wing, Barksdale AFB, Louisiana. 3- 93rd Bomb Wing, Castle AFB, California. 4-17th Bomb Wing, Beale AFB, California. 5- 5th Bomb Wing, Minot AFB, N.D. Individual F/FB-111 Mission. 1- 380th Bomb Wing, Plattsburgh AFB, N.Y. 2- 366th TFW, Mountain Home AFB, Idaho. 3- 366th TFW, Mountain Home AFB, Idaho. 4- 474th TFW, Nellis AFB, Nevada. 5- 509th Bomb Wing, Pease AFB, N.H. Individual KC-135 Mission. 1- 92nd Bomb Wing, Fairchild AFB, Washington. 2- 499th Bomb Wing, Kincheloe AFB, Michigan. 3- 7th Bomb Wing, Carswell AFB, Texas. 4- 916th AREFS, Travis AFB, California. 5- 11th AREFS, Altus AFB, Oklahoma.