In Iraq, a green idea for saving lives of troops

"The key is fuel: The more of it a base uses, the more soldiers are exposed to deadly roadside bombs on fuel convoys." (Source: LA Times article, Doug Smith and Saif Rasheed, Nov 22, 2007)   

I love how crowdsourcing innovation can lead to unexpected benefits.  The military expected to get some high tech, expensive gadgets.  But instead, they got barrels of goop.OK, so "barrels of petroleum-based goop" is not such "green idea" and it's not cheap.  But it's innovative.How could it be improved?  Maybe use lightweight re-inforced concrete foam instead of "plastic" foam.  Maybe use materials that are readily-available onsite.  Or, sink the tents 4 ft. down into the ground (i.e. in rows, with the excavated dirt/sand piled at both ends).  Prefab steel-reinforced concrete walls (poured onsite) could provide quick snap-together construction.The temperature is usually more mild underground, providing passive cooling during the day and heating at night.  Keeping a low profile provides added protection from flying shrapnel/debris.