I just got through doing a party for 12 year old boys. 7 of them. They ate 12 racks of spares. My Gosh.. they were not even that big the boys not the ribs.
Since you have Marines that A: have not been stateside in a while and B: are going back for a while... I would throw out the rule book and cook 3 times what you would normally serve and tell them, like my love for this country.....there will be no end to the ribs.
God Bless you Norcore
Popdaddy is Dead - 1933-2011 - Pitmaster T is a free agent