Thank you so much for responding to my post, this is most definitely the same Capt. Ralph McGuire who is buried at American Memorial Cemetery outside of Manila. There is an interesting book called Bataan Diary by Chris Schaefer. I wrote Mr. Schaefer and he helped me order the military records for Capt.McGuire which has quite a lot of detail. I would be glad to share that info if you are interested.
From what I read, Capt. McGuire knew how to use explosives from his work in the timber and mining business, and he put that to good use against the enemy.http://www.bataandiary.com/index.htm