From the article:
PT-76 (AAR031) includes one PT-76 Light Tank with .50cal AAMG (for Vietnam) and AAMG (for Arab Israeli)
Originally designed as an amphibious light tank, the PT-76 started its service in the early 1950s. The tank itself became the Soviet standard reconnaissance tank. The PT-76 was widely exported and found homes in many nations’ armies including Egypt and thus The United Arab Republic.