"When he finished his search he had an ephinay and wondered if any of the computers in the command bunker were working."
Do you mean "epiphany" ie an illuminating discovery or realisation, or the Coming of the Magi?
Unless of course this is another of the words like "color" or "labor" that seperate American English from the Queens English?
I would be tempted to use a much simpler word like "idea" or "thought", especially given the situation that the Gunny is in at the moment - its a matter of personal taste but for me "epiphany" has flavours of contemplation, reflection & working at a problem over time, and is usually more to do with an understanding of how the world works, or of ones own personal nature rather than the sort of immediate lightbulb incident you are describing - I don't think its quite appropiate for where the story is at this time.