Notes by RWF:

Wilfred R. Franson, a U.S. Army Air Forces instructor in celestial navigation for pilots at Charleston, South Carolina, was attending a school at Homestead Army Airfield in Florida. His wife Vera Howe Franson, for a period a civilian instructor in celestial navigation for Army pilots, remained at Charleston while he was at Homestead.

Some Army acronym hierarchy:
ATC: Air Transport Command
AAFBU: Army Air Forces Base Unit
OTU: Operational Training Unit

Wikipedia articles on Florida World War II Army Airfields
and specifically Homestead Army Airfield (later Homestead Air Reserve Base)
  

Vera Franson's use of "w", initial letter of Wilfred, replacing "u" as an abbreviation for "you" in the common postcard catch-phrase wish you were here, is I believe a deliberate typographical pun. That is, she wishes Wilfred were in Charleston with her. I suspect she also would have been happy if they were together in Milwaukee.

Vera was born in Milwaukee, Wisconsin; hence her choosing a hometown postcard to send from Charleston, South Carolina, where they lived during the latter years of World War II.

Milwaukee City Hall at Wikipedia

Victory in Europe was very recent: Nazi Germany surrendered on 8 May 1945.
  

  
Peace at Troynovant
the happy interregnum betwixt war & war:
admonitions, provocations, "peace in our time";
Home Front, Occupation & Reconstruction, veterans
  

  
More by Vera Howe Franson