a 10:00 pm Friday time slot to a 7:30 pm Monday time slot for the second season to capture a younger audience. It was hoped that TV viewers would identify more with a colonel rather than an Army Air Corps general. Lansing, had he remained, would have received limited air time with Burke's addition. For the second season, most of the supporting cast from the first season was replaced, with the exception of Major Stovall, Doc Kaiser, and an occasional appearance by General Pritchard. Other actors who did reappear after the first season played other characters. Edward Mulhare appeared twice – as different Luftwaffe officers. Bruce Dern appeared four times as three different characters. Tom Skerritt appeared five times, each time in a different role. The first two seasons were filmed in black-and-white, as ABC did not mandate prime time shows to be in color until the 1966-1967 season, but it also allowed the inclusion of actual World War II combat footage supplied by the U.S. Air Force and the library of 20th Century Fox movies. The inclusion of combat footage was often obvious, as it was often quite degraded. Limited usable combat footage often resulted in the same shot being reused in multiple episodes. For the third season, the TV series was filmed in color, but this season only ran for 17 episodes, with the series being canceled in midseason. Some of the combat footage used for the third season seemed to be in black-and-white footage tinted blue. Film footage from the 1940s was also used for take-offs and landings since the one B-17 to which the show had access could only taxi. To simulate different aircraft, it was frequently repainted. In later episodes, Gallagher flew as "mission control" in a North American P-51 Mustang. This plot scheme was added to cut production costs. The single-engine Mustang costs less to fly than the four-engined B-17, and requires only a single pilot rather than two pilots and several crewmen. A wartime precedent for this existed, however: Maj.-Gen. Earle E. Partridge, the G-3 (operations) commander of the 8th Air Force, used a P-51 modified for photo-reconnaissance work to take photographs of his bomber group formations for training and critiquing purposes. 12 O'Clock High was created in an episodic format, with no particular order for the episodes. A trio of episodes produced about a shuttle air raid to North Africa was in