Because it's old ground here. Gone over many times over the last couple years. Also, it's about the Marines, but I'm sure it carries to the Army as well. Many of the original complaints came from National Guard types that never figured in a million years that they would ever see a shot fired in anger. When I was there, early on, I never ran across anyone who didn't have body armor. The folks actually doing the fighting had the more recent stuff. The ones working in supply compounds and headquarters and what not had older, but still effective versions that were being upgraded over time. And, as far as trucks go - I don't care what the !@#$ you hang on the side, it's not going to be effective against a remotely detonated 155 mm HE round buried in a pile of crap on the side of the road. But, whatever makes Scraps feel better.
Now, the press says "x" people might not have died had if they had "y" armor. So, now they have it. Maybe someone will come up with statistics as to how many grunts get their heads blown off because they are too heavy and bulky to get through a window without snagging on something.