So I have to nitpick a little on the difference between army and Marines in this joke. Marines have artillery also, and army soldiers have instructions to “secu

So I have to nitpick a little on the difference between army and Marines in this joke. Marines have artillery also, and army soldiers have instructions to “secure” the building that is basically like what you said the Marines do. The difference in the use cases seem to be one where you know there are no non-combatants in the building and the building itself is not of any value (shell it to the ground), vs having to be more surgical and sweep every single floor (which poses more harm to the service members executing that mission)