I read somewhere, maybe on this forum, that there are some immediate attribute boosts if you have a 1 - 3 in the star/team synergy. I remember one of them has to do with healing faster, but I wanted to re-read the info but can't find it now. I don't even know if it was confirmed but if anyone knows about that, or read it somewhere please link/remind me.
In the game instructions and on the in-game pre-briefing (while waiting for match to start) it says the fire/squad team leader "receives an Honor bonus and provides a skill bonus for all nearby friendly soldiers" but I read some more in depth info somewhere. I know one was like a 30% healing speed bonus to all members in squad. I can't remember the others.
... Soldiers who stay in proximity to their Leaders will gain skill bonuses.
There are three levels of bonuses to be earned by the Fire-Team:
1) 1 team members in proximity of the team leader - Medic speed reduced an additional 10% 2) 2 team members in proximity of the team leader - "Breath" effect is improved by an additional 10% 3) 3 team members in proximity of the team leader - Chance to die instead of being incapacitated reduced by 30%