A variety of problems occurred with many of the remaining missions including poor or no imagery. Many of these difficulties were caused by the unreliable wire recording system carried by the Gambits (tape recorders were not yet in widespread use in the mid-1960s). Two satellites ended up in the Pacific Ocean. The first of them was 4012, launched on October 8, 1964. The Agena engine shut down after 1.5 seconds of operation and the GAMBIT did not attain orbit. An investigation of the failure found that an electrical short occurred in an engine relay box, resulting in a cutoff signal being issued 0.4 seconds after ignition. As soon as the engine arming command was stopped at 1.5 seconds, the Agena propulsion system shut down. Examination of factory records for the Agena found that a pair of metal screws from a little-used terminal connector had broken off and disappeared to parts unknown; it was speculated that they landed somewhere as to cause a short. Telemetry data indicated otherwise entirely normal performance of all Agena systems. The other failure was 4020, launched on 12 July 1965 when the Atlas programmer accidentally issued simultaneous SECO and BECO commands, the resultant propulsion system shutdown sending the launch vehicle into the Pacific Ocean some 680 miles downrange. The latter was the first flight witnessed by newly arrived Brig. Gen John L. Martin who replaced Maj. Gen Robert Greer as head of the KH-7 program. Martin cracked down and began demanding higher workmanship and quality standards. He is credited with having significantly improved the success rate of the program.