Again stupid question

Battle Sense
   Battle Sense is a bravery skill that rewards all classes for surviving combat.

Players gain ZERO points for each 30 seconds survived while 'Cold' i.e. not actively engaged in combat. You'll earn 2XP per 30 seconds while 'Warm' (you inflicted damage), 5XP per 30 seconds while 'Hot' (dealing AND receiving damage) and 8XP if 'Super-Hot' (killing and receiving damage).

    Battle Sense Level 1: Issued Binoculars
    Battle Sense Level 1 gives you a pair of Binoculars which can be used to reconnoiter enemy positions. Only Covert Ops can use Binoculars to spot Land Mines for their team-mates.

    Battle Sense Level 2: Improved Physical Fitness
    The powerful aerobic benefits of prolonged combat activity enable your Stamina bar to recharge at 160% of the normal rate.

    Battle Sense Level 3: Improved Health
    As a wily battle-hardened veteran, your combat expertise effectively increases your maximum Health by 15 points.

    Battle Sense Level 4: Trap Awareness
    Even if you're not a Covert Ops, you'll be able to sense enemy Land Mines without the aid of Binoculars. Any mines within a certain range will appear as translucent outlines in your field of vision. Unless you're a Covert Ops, you won't be able to spot them for your team-mates.