Shown here are two cards, one sent by correspondent Richard Johnston, the other by correspondent Charles Grutzner, both to their own (postal) addres. Neither were actually handled handled by the US Army-Air Force Postal Service, which means they probably do not qualify as ‘private usage’ in this instance. (See this KP article for the background to private usage of the APO system.) The APO 301 address related to Eighth Army HQ which was the relevant address for war correspondents – they did not classify as private individuals, as they were what today would be called ’embedded’ in army units.
I collect North and South Korean Postal History from 1945, focusing on the Korean War and the countries involved in the conflict and post-Armistice commissions. I live in London.