I (Raymond Caldwell) was a security guard at Barksdale AFB Oct 51-oct 52. The plane was loaded with aircraft engines for record weight flown. Partially completed, it had a minor structural failure, was unloaded, put in repair for about 4 months , repaired, loaded to max payload, flt summer of 52. Set world record.
http://www.air-and-space.com/xc99.htm