Vietnam has sought to address its security requirements by fielding a large military apparatus equipped with mostly Soviet-era weaponry that can be quickly reinforced by a massive reserve force armed with anything from World War II-era Soviet rifles to U.S. Main Battle Tanks dating from the 1960s. Modern equipment is relatively lacking in the inventory of the Vietnamese People's Army (VPA), with Vietnam instead preferring to upgrade existing weaponry to keep it combat effective in the 21st century. A prime example of this is the T-54M3 tank upgrade project.