Here's what I'm thinking:
Alpha Squad:
Squad leader: GySgt Anthony
Fireteam 1:
Cpl. Novan, Fireteam Leader/Marksman
LCpl. PandorasBox SAW gunner
LCpl. contritemeditation rifleman/Anti-Tank
(It's assumed that Anthony will be Fireteam 1's fourth person in most situations)
Fireteam 2:
Cpl. Vagos Marksman/Fireteam leader
3 open positions in Fireteam 2
(For those unaware, irl fireteams are four man teams made up of a grenadier, SAW gunner, assistant SAW gunner/rifleman, and a rifleman. There are usually two to three fireteams in a squad.)
Also, I have no idea how the UK's enlisted men ranking system works, I'm going off the USMC enlisted rank structure where Sergeant is E-5 and Staff Sergeant is E-6. Either way the next squad leader is still gonna be junior to Anthony.