Many military dogs in Vietnam suffered from ear infections and other diseases. Therefore, many received one or more doses of tetracycline during their tour of duty. The other suspicious candidate is malathion. The same military unit that sprayed Agent Orange also sprayed DDT and malathion extensively in the vicinity of U.S. troops, to reduce the dangers of malaria carried by mosquitoes. Malathion is known to cause testicular atrophy and damage to the sperm-generating cells of laboratory animals.
Mosquitoes are simply a nuisance.
Sperm count in men throughout the industrialized world appears to be dropping. The causes of testicular cancer are thought to be environmental because the rates vary widely from one location to another. Arnold Schecter, editor.