I think it’s one of the few pics of soldiers of the US Signal Corps I own (you have to trust me, the patches can be hardly seen on this pic but I own the original negative glass plate and have very high resolution versions of the same picture). The chevron on his left cuff is the “overseas stripe”, which shows he has spent 6 months overseas.
Il giorno più corto (also known as The Shortest Day) is a 1962 Italian Comedy film directed by Sergio Corbucci. This parody of the war movie The Longest Day stars the popular duo Ciccio Ingrassia and Franco Franchi in the leading roles. Dozens of many other well-known actors accepted to appear in the movie in cameo roles for free, to avert the bankruptcy of the production company Titanus.