Leadership
From AoP Wiki
Leadership is a possible secondary Skill you can level up during gameplay.
It's starting value is:
Being a secondary skill, it can be leveled up to 200%.
Each % increases the effectiveness of your outgoing Boosts if you are a Squad Leader of Fireteam Leader. You need at least 110% Leadership in order to give out boosts. However, their effectiveness will be close to 0. To give boosts with full effectiveness to your team, you need Leadership as maxed out as you possibly can.
The effectiveness of your boosts calculates as follows: