different support duties. The rest is made up of different smaller vessels such as the CB90. Currently the Swedish Airforce has a total of 210 aircraft, 94 of those being JAS39C/D Gripen (60 JAS39E on order), 6 C130H Hercules (1 with aerial refueling capabilities), 4 SAAB 340 (2 AEW&C and 2 VIP transport), 4 Gulfstream IV (2 SIGINT and 2 VIP transport) as well as 15 UH-60 Blackhawk and 18 NH90 helicopters. The rest is made up of different transport and trainer aircraft. History After a period of enhanced readiness during World War I, the Swedish Armed Forces were subject to severe downsizing during the interwar years. When World War II started, a large rearmament program was launched to once again guard Swedish neutrality, relying on mass male conscription to fill the ranks. After World War II, Sweden considered building nuclear weapons to deter a Soviet invasion. From 1945 to 1972 the Swedish government ran a clandestine nuclear weapons program under the guise of civilian defence research at the Swedish National Defence Research Institute. By the late 1950s, the work had reached the point where underground testing was feasible. However, at that time the Riksdag prohibited research and development of nuclear weapons, pledging that research should be done only for the purpose of defence against nuclear attack. The option to continue development was abandoned in 1966, and Sweden subsequently signed the Non-Proliferation Treaty in 1968. The program was finally concluded in 1972. During the Cold War, the wartime mass conscription system was kept in place to act as a deterrent to the Soviet Union, seen as the greatest military threat to Sweden. The end of the Cold War and the collapse of the Soviet Union meant that the perceived threat lessened and the armed forces were downsized, with conscription taking in fewer and fewer recruits until it was deactivated in 2010. Sweden remains a neutral country, but has cooperated with NATO since the Partnership for Peace in 1994. Sweden was one of five partner nations granted the status of Enhanced Opportunities Partner at NATO's Wales Summit in 2014, coinciding with Russia's illegal annexation of Crimea and intervention in Ukraine. The Russo-Georgian War of 2008 and the events in Ukraine in 2014 gradually shifted Swedish debate back in favour of increased defence spending, as concerns grew over Russia's military buildup and intentions. Conscription was reintroduced in 2017 to supplement the insufficient