These agreements led to a flood of equipment and supplies necessary for a modern, conventional army. This included 400 T-34, T-54 and Type 59 (a Chinese version of the T-54) medium and 200 PT-76 light amphibious tanks, hundreds of anti-aircraft missiles, including the shoulder-fired, heat-seeking SA-7 Strela (called the Grail in the West), anti-tank missiles, including the wire-guided AT-3 Sagger and heavy-caliber, long-range artillery. To man the new equipment, 25,000 North Vietnamese troops received specialized training abroad, 80 percent of them in the Soviet Union or Eastern Europe. A contingent of high-level Soviet military personnel also arrived in Vietnam and stayed until March 1972 in preparation for the offensive.