You get to change your care package. For example if you get amo, you can change it to a spy plane
it makes kill streaks 2 kills less
This allows you to change a care package once per package.
If you mean like a care package then it requires Hardline Pro.
Highlight the perk, press square (or whatever button for your console) and read about the challenges required.
you cant force car packages to be better but you can use hardline pro to ''reroll'' the package, changing its contents
get hardline pro get a care package double tap square or X to change it
Set your kill streaks to care package then get 5 kills (4, if you are using Hardline) then hopefully you will get a death machine. If you got Hardline Pro you got two attempts to get it. I got 3 death machines in one combat training match while using Hardline Pro.
COD black ops is one game i know that is compatiable
You cant. When you get kills, that will add to your kill streak. Unless you have hardline pro (black ops), Which decreases the number by one.
To get the pro perks in Black Ops you first have to purchase the perk (obviously, and if you don't know they are 2000 cod points). Then, you will need to complete 3 challenges which are under the perks challenges section and then once the challenges are done you will have to pay more cod points to upgrade the perk.
It is a Perk used to gain a killstreak with one less kill. Very use full if you choke under pressure to get your killstreak. Hardline Pro gives access to change the care package drop to another random thing.
Hardline pro will make your death streak cost one less death