[Jack]

Well, yes, but.....
Remember that the ammo the Garand was configured for was at slightly lower pressure than modern factory ammo. Modern factory ammo isn't enough hotter to blow up a Garand, or anywhere near it, but I'd suspect over time the wear on the Garand mechanism would be more with modern factory ammo than with military ammo.
There are some good deals out there on military 30-06 ammo in Garand clips and bandoliers. A whole ammo can of it- 384 rounds, can be had for a really low price- and the brass is Boxer primed, so it's reloadable.
Do keep in mind some military stuff is corrosive, so, if you use the military, clean the rifle before putting it away.
Try Cheaperthandirt or Sportsman's Guide- saw one of those ammo can deals in one or the other recently.
So, I guess I'm saying you can use modern factory ammo, but military stuff is better for the gun in the long run.