Click the key to use the Care Package / EAD. Hold down the button, don't throw it. Go up to a ledge where is says "X to jump over" (PS3). Click X and while going over, click secondary/primary grenade and hold that down. You should have your Shoot button still held down for CP/EAD. Now, hit Right again to make your ammo disappear, then let go of secondary/primary grenade/knife etc. you should still have the CP throw button held down. After the grenade is thrown, it will take your CP back out, throw it then. Pick it up, use it, and youll have CP/EAD back. If ammo is all you get, then you need to die for your CP/EAD back.
I WILL POST A LINK WITH A VIDEO TUTORIAL OR SOMETHING FOR YOU IF I CAN FIND ONE.
FYI! THE CARE PACKAGES/EMERGENCE AIR DROPS YOU CALL IN DON'T COUNT TOWARDS CALLING THEM IN FOR CHALLENGE, BUT EVERYTHING YOU GET FROM IT AND USE DOES COUNT.
Here is a video example.
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