Andy Griffith did not serve in the military. He did, however, play several military acting roles. He was also awarded a Presidential Medal of Freedom in 2005 for his contributions to national interests.
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I don't think it was ever brought up, but at the beginning Andy talks of losing his wife (Opie's mom), which why Aunt Bea lives with them.
If this was the title character, certainly, a Police-type garrison hat, as officers customarily wear even indoors, like the Pentagon.
No he is just pro military
Barney's mother appeared in at least one episode. Season 1, Episode 2. "The Manhunt" when state police come to Mayberry and set up roadblocks to capture an escaped criminal. Andy and Barney set up a roadblock on the dirt road by the lake. Barney frisks the mayor and his own mother, among others.