I just came across this and had to mention it.  As a military member myself I really appreciate  it when my fellow service members are recognized for their service and sacrifice and Google has really stepped up to the plate with this one.

Being in the military often presents unique challenges for staying in touch, which is why we are giving away priority invites to military personnel.

Please leave your .mil email address (so we know you are in the military), and we’ll send you a Google Voice invite within a day or two. If you don’t have a .mil address, you can request an invite here. You need to be in the US and have a US phone to sign up for Google Voice.

I know it seems like a simple thing but calls from overseas can be very expensive and having the ability to use Google Voice to leave messages or have a conversation that does not cost a lot is a HUGE benefit for our deployed service members.

Google Voice Military Invites Sign Up Page