The last combat mission to take place in the Indo-Pacific was in May of 1975 in the region of Cambodia against Khmer Rouge. A possible cause of this success is improved intelligence gathering abilities and forward-deployed forces. U.S. presence has given the countries more time to stabilize and presented a message that antagonistic plans will not be tolerated. However, in the last decade activity seems to be on the rise. North Korea sunk a South Korean ship and China fought with the Philippines over the Scarborough Shoal.