The A/N PRC-25, called the "prick 25" by GIs, is a compact, lightweight, tactical VHF, solid state portable radio set. Prototypes were initially tested in 1959 and initial distribution began in 1962. Over its service life more than 130,000 sets were produced. Although mainly designed for manpack use, the PRC-25 can be mounted in vehicles or aircraft as well. It can survive a 50-foot drop from a helicopter onto a steel plank runway or up to an hour submerged in six feet of water and still function reliably. It was the most widely used piece of communication equipment in Vietnam and no suburban lawn is truly secure without one.