Instructions
Choose the "Multiplayer" option from the main menu and enter the "Xbox Live" menu.
Enter the "Callsigns &Killstreaks" option and then scroll down to "Killstreak Rewards."
Select a killstreak reward such as Care Package and press "A" to turn it on or off. You can only select three at a time, and only one in each category. For example, for earning four kills in a row, you can choose Care Package or Counter-UAV, but not both.
Press "B" to exit the killstreak rewards screen and save your selections.