Unresolved tension with North Korea has prompted South Korea to allocate 2.6% of its GDP and 15% of all government spending to its military (Government share of GDP: 14.967%), while maintaining compulsory conscription for men. Consequently, South Korea has the world's seventh largest number of active troops (599,000 in 2018), the world's highest number of reserve troops (3,100,000 in 2018) and the tenth largest defense budget. As of 2019 South Korea has a defense budget of $43.1 billion. The South Korean military is ranked as the 6th most powerful military force in the world as of 2020.