Thank You ,the one link you just sent has been the only link i've found on the 51. Any other information on that number has been mixed in with some of the other Corp of Engineers...And you may be right that they where not a division. I do know for certain that he was a Corp of Engineer(combat)and that he served from Oct. 1943-Mar.1946. Also learn He was a Lt. for alittle while then went back to Sargent. My dad said Grandfather didn't like being a Lt.
And your right this is like trying to find a needle in a hay stack.