The Vietnam War POW/MIA issue concerns the fate of United States servicemen who were reported as missing in action (MIA) during the Vietnam War and associated theaters of operation in Southeast Asia. The term also refers to issues related to the treatment of affected family members by the governments involved in these conflicts. Following the Paris Peace Accords of 1973, 591 U.S. prisoners of war (POWs) were returned during Operation Homecoming. The U.S. listed about 2,500 Americans as prisoners of war or missing in action but only 1,200 Americans were reported to have been killed in action with no body recovered. Many of these were airmen who were shot down over North Vietnam or Laos. Investigations of these incidents have involved determining whether the men involved survived being shot down. If they did not survive, then the U.S. government considered efforts to recover their remains. POW/MIA activists played a role in pushing the U.S. government to improve its efforts in resolving the fates of these missing service members. Progress in doing so was slow until the mid-1980s when relations between the U.S. and Vietnam began to improve and more cooperative efforts were undertaken. Normalization of the U.S. relations with Vietnam in the mid-1990s was a culmination of this process.