You must play Battlefield it like it was a Sandbox Game.
Everybody is a NPC.

Kill players like you were killing zombies from Dead Rising.
Find the most craziest and fast way to kill them, and also killing a lot of them in a row.

Someone is playing better?
Steal their kits, its like capturing their souls. 

People in your team are like the creeps from Dota.
They will die a lot and there is nothing that you can do about it, that's why you must protect them to last enough to damage enemy players.

That's how I become a Colonel. 
And I love Battlefield a lot because that.