My grandpa was in US Army and it made a difference in his life. What branch of the military did you or do you serve?

Sarahplus2
Don't know the years but my grandpa was in the US Army in the early 60s. He was deaf in one ear, but kept that to himself and served his time.
My grandpa was in US Army and it made a difference in his life. What branch of the military did you or do you serve?
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