To my knowledge, the FTL really isn’t supposed to be doing a lot except saying "move there" and then moving the right way. So, OK…you should know how to read a map relatively fast. The fireteam should be a unit and not split up. You listen to your SL and he tells you what to do. That’s it.
Getting too creative as an FTL can be a problem because you may get the itch to go and do something you weren’t told to do or get frustrated because you see something your SL does not, so you start doing things on your own. That’s not good. You may end up dead doing what the SL tells you, but your SL is supposed to know what he’s doing and if you all die for his errors, it’s on him.
That said, there may be situations when you’re under fire and you have to think fast and that’s your chance to shine. Your guys will listen to your lead, but you gotta have the attitude that you know what you’re doing. It doesn’t matter if you don’t. Just tell them what to do.
Some general things to consider (and this is something I’ve noticed people tend to skip a lot) is that movement is good. If an enemy is already firing upon you and you’re not sure where they are, that means they DO have advantage. Now, you may sit there and try to pot-shot them or negate their advantage, but someone is likely to get hurt or dead. Rather than be static, my suggestion is to remember the basics - use Peeling and suppressive fire for your buddy teams and use smoke to cover your movement. Do both of those things fast. Your instinct should not be to stand and fight because that’s what you have multiple teams for and they should be covering each other. While you move to a positive location, which may just be 5 meters further behind a slope, your other fireteams should clock in on the enemy location and open fire. That’s when you come back in and start laying them down too.
Even if there is no secondary team, this still gives you the chance to regroup, reload and flank.
That’s how I wish we were playing. Sadly, I can’t make ops on time, so I mostly play a trigger happy rifleman
EDIT: Not to extend replies too far wide and as a response to Goat.
Good call on the supply and positioning bit. If your team has been up for a long time, check if they’re solid on supplies and always be aware of other FT positions.
What i disagree with is the SL responsibility. Personally, I find leading a team is simple, but leading two or three, tracking their movement, terrain, enemy position, comms…and actually achieving your goal…that’s a heavy burden.