IF the support class lets you store killstreaks there really is no need to ever carry a stinger. Just dump down a sam turret or EMP them.
Playing a game type with objectives everyone should run support strike, you would be unbeatable against a team trying to get kills for the assault strike package. You could instantly take down whatever they threw up and no one would have to carry a launcher.
You could keep throwing yourself at capture points etc safe in the knowledge they are adding to your streak and it doesn't matter if you die.
The assault package also has no counter UAV. A team of 6 with support class would be pretty damn hard to beat on objective games.
That and the ability to scroll between killstreaks should mean you can keep your EMP in readyness for the moment when they send the AC130 up. Just keep it sat there and then BOOM ! take it down.
Considering i'm not a very careful player and usually have a high amount of deaths, i know i'll be using the Support Strike Package.