Goku battles Colonel Silver after his Flying Nimbus is shot down there by Silver himself. After he defeats Silver, he uses one of the planes and a robot pilot from two capsules to take him to the location of the next Dragon Ball. The camp contained a runway, presumably for the launch of several of their planes. It was presumably abandoned after the Red Ribbon Army was defeated.
Colonel Silver's Camp is level 1-3 in the video game Dragon Ball: Origins 2.