Charles Burch - U.S. Amry - Pacific Theater

I am searching for information regarding my grandfather, Charles Burch and his involvement in WWII. He was from Texas and as far as I know enlisted before the outbreak of the war. I have heard that he was stationed near Pearl Harbor on Dec. 7th, 1941. but otherwise, I have no info or anywhere to start searching.

Any info would be appreciated.

thanks

Eric Burch