If it took 24 hits (presumably with a 9mm) to stop this guy, I seriously doubt the .223 Remington is the "magic bullet" they seem to be looking for. Personally, I think they'd be better off with the M1 .30 Carbine over the AR-15/.223.
Benjamin Griggs, 58, a mentally ill Vietnam War veteran who held police at bay for two hours...three colleagues were killed with rifle bullets that pierced their armored vests
Arming officers with a .223 won't change the fact that Kevlar soft body armor will not stop a centerfire rifle round.
And please don't mention the Kevlar/rifle bullet matter. Ted Kennedy will read it and go on another BAN ALL RIFLE ammo cr@p again. (joking)
Your right, kevlar won't stop some hp rounds, but an officer armed w/an ar-15, m-14,etc. can shoot with greater accuracy, and at a greater(safer) distance.