You can join the military... That's one way to get a certificate. Actually it's the only way I know how.
The way to get the military symantec antivirus is to have the military member go to their computer resources office and have them help get it onto a CD or portable hard drive. Flash drives are not authorized on military networks and the geniuses who run the network also disabled CD burning, so their solution is to allow portable USB hard drives... I can plug in a 2 terabyte external hard drive to a military network, and this is somehow less of a threat than a 2gb thumbdrive or burning a 640MB cdrom? Bunch of geniuses running the network, yessir, geeeeeeniuses.
In any case, you need to get it from within the network, and it needs to be from someone authorized to be on the network in the first place.