for xbox 360,firstly get close to a object till it comes up with press A,before u press A get out ur care or emergency marker then press A,but as u press a tap the get out the marker 2 times(one after other).
once on the object with the marker out throw the marker pick up 1,then use it then u will have another.
but if it is AMMO kill urself coz u wont get another till u die.
pretty cool add me on xbox live it is
ty for reading
You can do it on pc do guys
You grab your carepackage hold down left mouse go at a place where you press Space
Then hit it quickly press "G" (Equipment) It has to be Tactical Insertion while doing that press 4/Carepackage while it's putting it down
Hope this was better English ...