FILE - In this Sept. 18, 1996 file photo, South Korean soldiers tie up their rubber raft before starting an inspection of a North Korean submarine which was found aground on a reef near South Korea's east coast town of Kangnung, northeast of Seoul. North Korea's military, founded 81 years ago Thursday, April 25, 2013, is older than the country itself. It began as an anti-Japanese militia and is now the heart of the nation's “military first” policy. Experts believe guerrilla warfare would be the North's most viable strategy in the event of conflict, since its conventional army suffers from aging equipment and a shortage of firepower. In 1996, 26 North Korean agents infiltrated South Korea's northeastern mountains after their submarine broke down, sparking a manhunt that left all but two of them dead, along with 13 South Korean soldiers and civilians.(AP Photo/Ahn Young-joon, File)