Is there any other information regarding his name etc?
Not much to go on. you could search the NARA database but with only a last name, and it not being rare it would be like searching for that needle.
My greatest fear is that one day I will die and my wife will sell my guns for what I told her I paid for them
"Don't tell me these are investments if you never intend to sell anything" (Quote: Wife)
NARA has a POW database and I didn't see a Hanson with either a 3861 or a 5182 in their service number. I'm not sure how complete this database is though.
There's about 3,700 individuals with the name Hanson in the general database, so as Michael said above, it is a needle in a hay stack. That database is also incomplete.
I just tried another site where you can search by laundry number Home | WWII US Army Enlistment Records and received one hit using H-3861 and H-5182.
Ralph M Hanson Jr
View Record: Ralph M Jr Hanson - 19095182 | WWII US Army Enlistment Records
Maybe this is your guy?
The 8th Service Command was a stateside unit in charge of military operations in Arkansas, Louisiana, Texas, New Mexico, and Oklahoma. Their headquarters was in Dallas, Tx.
I'm interested in how you are connecting this service coat to the soldier being a POW? It's possible that this soldier never even left the USA.
The writing on the liner has been done with a felt tip marker recently. I would put no trust in it at all.
Good point Steve.