I would either call the airlines directly to see what kind of military discount they give, check skyscanner.com for prices or even abctravel.de for airfare. I have used abctravel.de before and they were the best price for me. Space A wasn't working out to get back to Europe so I bought tickets through abctravel.de 3 days before we flew and they were the same price if I had bought them a month out. I don't know his unit at all, but some units are understanding about Space A and the delays, others are not. That is a decision he would have to make on his own through talking to command and going from there. I personally, don't like the stress of having a time frame, so I would buy the tickets. Munich is a great place, as well all of Germany is really. They are a short drive to Garmisch-Partenkirchen, Germany (Edelweiss is there for US military, great place) Innsbruck, Austria, Bolzano, Italy, they could even hit up Prague for cheap while there. Lots to do in the surrounding area, one of my favorites!