Harvey can.
He's been an agent for more then 15 years and his speciality is exactly this kind of operation.
He always works alone and he's extremelely good at his job.
My basic plan is when we get into fights I'll stay out of sight until after you all engage unless it's something that I have to make the first move.
Chiefly because Harvey is best used for stealth kills so if you all engage first the noise of non suppressed gunfire and explosions will easily drown out my suppressed weapons meaning if I stick to the flanks to attack from I have a high chance of not being noticed. The enemy is not going to look for me when all they know is people are being shot while 6 of you are shooting at them.
Thats the main reason I'm staying outside the group, Harvey is at his best working his own way in suipport rather then as a direct part of the group.
Plus he's always worked alone so being with you all would make him extremely uncomfortable, remember your all here because you were chosen. I'm here because I was ordered to be here. This is way outside Harveys comfort zone but he has 2 jobs here.
1 to teach all of you how to fight this kind of war because all of you are more direct combat types and this is not going to be a direct war so he was sent because the team requires somebody who knows how to fight this way and because he's been in the enemy nation before and always come back out safely and mission completed.
The other mission is basically if this goes badly and the team is compromised under no circumstances can the general be taken alive, he has to much information so if it goes wrong my over riding priority is to ensure he escapes or failing that to execute him myself before he can be taken for questioning by any means, up to and including making a suicide stand myself to slow down the enemy for him to escape.