6 green things the U.S. military is doing: More power on less oil
Realistically speaking, the only part of the US economy that works is the military-industrial complex and that is not likely to change. However, it is hard to think of ordinance as being "green" although they do remove humans who are considered to be undesirables from the planet.
One thing you have to remember, Cost is never an issue with the US governement. Go LEED, up front cost, time, time it takes for a payback isnt an issue. being Green, means, lots of money up front.