I'm sorry for the loss of your friend, and very grateful for his service. I have no doubt you'll be receiving plenty of supportive messages and links in your email, but here's one video I find very powerful. It's "Arlington" by Trace Adkins (if you can stomach country music). I guess radio stations consider it too political because I've never heard it on the air, but he conveys his message in a very respectful manner.
http://music.yahoo.com/video/22921559
I'll also mention that my 22 y/o son is strongly considering joining the Marines this year and my 16 y/o step-son is planning to sign up for the delayed entry program for the Army to enlist when he finishes high school. It's terrifying to contemplate them being deployed, but I support them and consider it an honorable thing to do.