FedEx has partnered with the Christmas Spirit Foundation ship live Christmas trees for troops. 

http://www.christmasspiritfoundation.org/programs/trees4troops/home.htm

From their website:

“Consumers can also participate in the Trees for Troops weekend on Saturday, Dec. 1 - Sunday, Dec. 2. During Trees for Troops Weekend, consumers at select retail lots around the country can purchase a tree that will be distributed to a deserving military family. Look for information soon about Trees for Troops Weekend locations and base delivery locations!”