Air Force veterans who served on a top secret base known as Area 52 claim that working on the nuclear testing site left them with “all kinds of cancers” and other health issues — but the U.S. government won’t compensate them because they can’t prove they were there, RadarOnline.com has learned. For decades, the government conducted nuclear bomb tests in the area, located at the Tonopah Test Range 140 miles outside of Las Vegas in the Nevada desert. A 1975 federal environmental assessment acknowledged that the tests scattered toxic radioactive material nearby but claimed that halting the missio…