VT-28 at Corpus Christi, Texas flew the Tracker as a multi-engine trainer from 1960 until 1979 when the TS-2A was replaced by the T-44 Pegasus (King Air). Another photo shows that D-409 is BuNo 136446, D-440 is BuNo133328 and D-413 is BuNo 136497. Seen at Alameda, these aircraft have probably already finished their career with VT-28 here. 133328 is on record as going to the MASDC boneyard earlier that month, but was returned to service. Joe Baugher's US serials website doesn't have details for the other three. Photo by: Dave Maclean / National Archives at College Park, Maryland