Recently when I was playing on warzone assault I decided to test something. I went up to the front door of the armory where grunts stood (my teams objective was to to capture the garage). I began to melee the shield causing the grunts to shoot at me behind the barrier. They killed themselves. Then I went on top of the armory and it got captured in 5 seconds.
This is a pretty bad glitch/exploit and I hope that you all can find a fix somehow.
Respectively,
-MetalWhiteWolf