That person would make a great #1 man/woman in the stack. He/She would block all and any bullets with His/Her XXXXL sapi plate allowing the rest of the team to take the objective no problem. Only problem is He/She might get stuck in the fatal funnel.
This thing has got to be a doctored photo. I know for a fact those Advanced combat helmets don't come that large. I had 2 earth/melon headed guys in my squad and they got stuck with the old kevlars for that reason. Pretty good job doctoring it though.