This is a wonderful color video of Silverplate bombers and this is most likely Kirtland Field and I also suspect that these aircraft are involved in the continuation of Project W-47 at Kirtland Field. The date however is wrong, this is not 18 April 1944 as A-bomb drop testing on that date was still being performed at Muroc Field, CA (later Edwards AFB) in the only prototype Silverplate B-29-5-BW-42-6259 that still had her four gun turrets installed. The first batch of (17) modified Silverplate B-29’s were delivered to Wendover Field from October to December 1944. Three going to the 216th AAF Base Unit (Special) who worked with Los Alamos Laboratories (LAL) regarding ballistic and systems verification drop testing of the new weapons and Fourteen to the 509th CG,specifically to their 393rd Bombardment Squadron (VH) for their “combat training” to drop these new weapons, the 509th CG had very little to do with the testing effort, their concentration was on combat delivery of the weapons. This is also not the 509th CG; at least not on 18 April 1944 for all the reasons above and the fact that the 509th CG was not activated until 17 December 1944; see “The Silverplate Bombers” by Richard H. Campbell, p. 9 -12 and “The 509th Remembered” edited by Robert Krauss, p. 1 and Air Power History, Winter 2012 edition “The Other Atomic Bomb Commander: Col. Cliff Heflin and his ‘Special’ 216th AAF Base Unit” by Darrell F. Dvorak.
My best guess is that this video is Kirtland Field, but post WWII and is the continuation of Project W-47 by the 237th AAF BU (later the) 428th AAF BU operating from Kirtland. Wendover Field, Special Order #275 dated 9 Oct. 1945 transferred the entire 216th AAF BU (Sp) Flight Test Section from Wendover Field to Kirtland Field into the 237th which was redesigned 428th in February 1946. The intent of this move was to shift the aerial testing component from Wendover Field, UT closer to LAL with Kirtland Field, NM being selected for the continuation of what was still called Project W-47. Just an aside the 216th (Sp) Special Ordnance Detachment (SOD) [the Wendover test bomb builders] was also transferred nearby at Oxnard Field, later to become Sandia Base and today Sandia National Laboratories; see Dvorak 2012 for more detail on the 216th AAFBU (Sp), Wendover Field, 2nd Air Force.
Less clear is the weapon dropped at 3:22 which may not be a dummy or pumpkin bomb, the none nuclear equivalent to Fat Man used in training by the 509th as well as in combat. Because of the joint lugs on the side of this weapon at 3:22 it may be a test Fat Man model 1561 unit or a post war Mark 3 weapon nearly identical to Fat Man.
Overall, I’ll still rate the video a Five for content, it would be nice to have the description changed after some verification research to insure I’m not up in the wind.