Corona (satellite) retrieved two days later by a C-119 Flying Boxcar transport plane. This was the first successful return of photographic film from orbit. In comparison, Sputnik 5 was launched into orbit on August 19, 1960, one day after the launch of Discoverer 14. Sputnik 5 was a biosatellite that took into orbit the two Soviet space dogs, Belka and Strelka, and then safely returned them to the Earth . At least two launches of "Discoverers" were used to test satellites for the Missile Defense Alarm System (MIDAS), an early missile-launch-detection program that used infrared cameras to detect the heat signature of
Safe at Home lost track "Knee Deep in the Blues" (originally a single by Marty Robbins in 1957) from the "Safe at Home" sessions was re-discovered and issued on that anthology, as well as on the 2004 compact disc re-release of "Safe at Home" (the original mid-1980s CD pressing having been on the tiny Shiloh Records). Reviews of "Safe at Home" have been mixed but generally positive. Upon its 1968 release, renowned music journalist Robert Christgau seemed pleasantly surprised by the notion of "four smiling longhairs" playing skillful country music, referring to the album as "a good record and a brilliant conception." Parsons'