According to the video there is a hidden 4th killstreak that is always active on any strike package. 25 non-killstreak kills will give you access to a MOAB (Massive Ordinance Airblast) bomb. It kills the everyone on the other team once and leaves them EMPed for the rest of the game.
Even if it is valid I can't say I have a problem with it. It doesn't end the game and if someone is getting 25 unanswered gun kills they kinda had the game won already anyway.