The pilot had not been in contact with any ground station, but Houston ATC radar recorded a target that was most likely the T-34. Squawking 1200, the target flew at 3,500 feet for 12 minutes then began a gradual descent. After two minutes, it abruptly climbed from 3,200 feet to 3,600 feet in 12 seconds, then descended 1,500 feet in the next 12 seconds before disappearing from radar. During this time, the direction of flight was generally south- or southeast-bound, not westbound, as witnesses reported. The discrepancy was unexplained.