An army tank undergoes testing at what was believed to be the world's largest outdoor compact antenna range, designed and built by GTRI, at the U.S. Army's Electronic Proving Grounds, Fort Huachuca, Arizona

An army tank undergoes testing at what was believed to be the world's largest outdoor compact antenna range, designed and built by GTRI, at the U.S. Army's Electronic Proving Grounds, Fort Huachuca, Arizona