User blog comment:Pedro9basket/Battlefield 3 Pre-orders matching Call of Duty: Black Ops sales/@comment-66.188.54.172-20110727034551/@comment-5524047-20110730000917

tac·tic/ˈtaktik/Noun 1. An action or strategy carefully planned to achieve a specific end. 2. The art of disposing armed forces in order of battle and of organizing operations, esp. during contact with an enemy.

So it seems that in both games players use tactics, but the difference is that tactics used by Battlefield players will - or are considered to - affect the team more then Call of Duty, where players use tactics in a more independent manner. Admittedly Battlefield players are more like Douglas Haig then Sun Tzu when it comes to tactics, but still...

An engineer repairs a tank, that then guards the M-COM station from being disarmed before moving up and destroying the Hind before it could take off has more of a knock-on effect for the team then a Call of Duty player setting up a sentry gun in a choke-point and killing a chap before he could unleash a chopper gunner.