re APO 25 to Milwaukee:
He survived.
The National Archives and Records Administration website look-up for Army enlistments has his serial number identified more fully as Max E Kwiatkowski of Milwaukee, WI born 1908, etc.
https://aad.archives.gov/aad/displa...0&txt_24983=The Find A Grave website shows an apparent match for him living 1908-1979:
https://www.findagrave.com/memorial...-kwiatkowskiAn additional interesting note to this cover is the circled "7" after Milwaukee. This is the Zone number copied from Boston's 1920-era Zone system and implemented nationwide in May 1943 in about 125 U.S. large cities to help mail sorting during wartime when many mail clerks had been drafted. A June 1943 cover is fairly early to find it in use and why it is specifically worthy to point out here.
When Zip Codes were introduced in 1963, 3 leading digits were added along with an extra space-filling "0" to make a 5-digit number. Even today, Google maps shows the 2833 S Burrell St address with a Zip Code of 5320
7 a direct connection back to 1943.