"Beehive Round" by Martin Limón, in Alfred Hitchcock's Mystery Magazine, September 2012.
So when I started this story and saw that it was set in the same time and place I was patienly expecting Sergeants Sueño and Bascom to arrive. They don't. The crime this time is solved by Vern Kruckman, a newly-retired sergeant.
Like the cliche of the retired firehorse reacting to a bell, Kruckman leaps out of bed when an alert is sigalled. Unable to sleep he goes outside and this puts him in the right place at the right time to discover a murder. Both the Korean police and the U.S. army would be happy to cover it up for their own reasons, but Kruckman, with time on his hands, and a sense of duty to the other soldiers, keeps after it.
Limón is a master of setting. He gives you all the details you need to believe in this foreign and forty-year old situation.