Although World War II is technically over, Arnold is now posted to Camp Pinedale near Fresno, California. He mentions his stay at home (by which he certainly means Glendale), so perhaps that stay included the visit to Mount Wilson.
Suntan pants and shirts are trousers and shirts of lightweight tan or khaki fabric that make up the summer uniform of some branches of the military.
There are no more letters from 1945 — a gap in the record. The next information from Arnold shows him in Japan in early 1946, then moving on quickly to Korea, where he will spend several months.
I could not figure out the date of this black and white photo; it looks to be in a desert. Perhaps it is from the San Joaquin Valley, with the Sierra Nevada Mountain foothills in the background.
next post February 1946 arrival in Japan
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first post in Arnold's Story July 1943
first post in blog Leonard's Story: May 29, 1943