what service was he involved in postwar ?
He was called for temporary duty and reassignment and was discharged with the rank of first lieutenant.
Audie Murphy

Murphy was one of several military personnel who received orders on 8 June 1945 to report to Fort Sam Houston in San Antonio, Texas, for temporary duty and reassignment. Upon arrival on 13 June, he was one of four assigned to Fort Sam Houston Army Ground & Services Redistribution Station and sent home for 30 days of recuperation, with permission to travel anywhere within the United States during that period. While on leave, Murphy was feted with parades, banquets, and speeches. He received a belated Good Conduct Medal on 21 August.

He was discharged with the rank of first lieutenant at a 50 percent disability classification on 21 September and transferred to the Officers' Reserve Corps.
who is the most highly decorated soldier in us history Audie Murphy. who is he ? He was an American soldier, actor, songwriter, and rancher. where was he born ? Kingston in Hunt County, Texas. did he act in any films ? Yes, Beyond Glory, The Kid from Texas, Sierra, Column South to name a few. how did he contribute during world war ii ? He was in the U.S. Army took advanced infantry training. During basic training, he earned the Marksman Badge with Rifle Component Bar and Expert Badge with Bayonet Component Bar. did he write any songs ? Yes, He along with  songwriter Scott Turner wrote numerous songs between 1962 and 1970. Shutters and Boards" and "When the Wind Blows in Chicago" to name a few. how did he die ? He was killed in a plane crash. name some of his decorations ? American Campaign Medal, the European–African–Middle Eastern Campaign Medal, 9 campaign stars, the World War II Victory Medal to name a few. did he suffer from any specific type of stress ? Yes, He suffered Post-traumatic stress. what is this disease ? UNANSWERABLE
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Audie Murphy [SEP] Postwar military service
Inquiries were made through official channels about the prospect of Murphy attending West Point upon his return to the United States, but he never enrolled. According to author Don Graham, Murphy suggested the idea and then dropped it, possibly when he realized the extent of academic preparation needed to pass the entrance exam. Murphy was one of several military personnel who received orders on 8 June 1945 to report to Fort Sam Houston in San Antonio, Texas, for temporary duty and reassignment. Upon arrival on 13 June, he was one of four assigned to Fort Sam Houston Army Ground & Services Redistribution Station and sent home for 30 days of recuperation, with permission to travel anywhere within the United States during that period.