i forgot to include the fact that NEP (new enemy placement) is good for getting more enemy vehicle kills. before NEP, beach head had about 1-3 or 4 vehicles but now, it is more like 3-6 or 7 (i don't count) and on instilation 04, there are way more banshees along with holdout. when ever you kill a banshee, about 2 minutes later, one takes its place. NEP is a great way to get the "Flat Tire" challenge.
I still hate NEP. Just add the vehicles without changing the enemy lineup.