I'm going to say some things that are different from the others so far, so bear with me...

Rules for FTL in this game...:

1) Forget the map/waypoint system other then for pointing you in the right direction unless you are playing with bots on your team. (bots need constant direction) You are leading 3 other guys, and there is really no reason to ever seperate the fireteam into 2 smaller groups due to how objectives/enemies are laid out. If 3 other guys cant stay with you, well, honestly find new guys to play with or quit moving without telling your team. It's your job to keep your team organized and together, dont forget that.

2)Recognize your squads loadout, and lead them accordingly. Some maps have the FTL with the only scoped weapon in the squad, you will have to lead your troops accordingly and direct their fire more precisely for some of the longer range engagements. Always ditch un-scoped weapons (except for the grenadier until he runs out of grenades) for scoped upgrades whenever possible.

3) It is the FTL's job to keep the medic alive, you should never lead him into trouble. If the medic isnt the last one to die, re-examine your tactics. Constantly let your medic know he has to stay out of trouble as much as possible, otherwise he might not be there later on to play the role of "hero". I typically let the medic pick up the first "found" scoped weapon, so he can be usefull while at a safe distance.

4) Steal vehicles whenever it's prudent, and use your remaining force to protect that vehicle! Mission #3 is easy as all get out if you take a stryker right at mission start and keep it alive until the end. Be sure to allow your infantry to disembark from the vehicle before you get into a hot zone, if they watch your back, you won't regret it.

5)Remember "mission first, killing second". The only time you have to engage enemies is when the mission demands it. (destroy an AAA truck guarded by 4 tangos) You will find the missions go a lot smoother when you dont spend 15 minutes trying to figure out a perfect method to take a fortified position you really could have just avoided in the first place. Dont risk your life, or your squads lives unless you HAVE to.

6) Use terrain smartly, while once the enemies know you are there, grass wont help you hide, if they dont know you are there, you can get pretty close to them if you move smartly and are patient.

7) Information wins battles. Just because you aren't engaging enemies you dont have to doesnt mean you should steer clear of all enemies. Knowing where they are makes it easier to predict where enemy reinforcements might come from, and you can deploy your troops accordingly.