And all Specialists will have Field Surgeon. EDIT3: Well, at least 1 of the 2 or 3 Specialists on the squad. Maybe 2 Field Surgeons.
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Field Surgeon reduces the seriousness of wounds that didn't get to bleeding out and can possibly stack (2nd and later get a roll), reducing soldier recovery times. Medical Protocol (with a carried medkit for 2 charges for the GREMLIN) and later Restoration is the primary source of healing / stabilization, even to the point of forgoing Trojan.
EDIT1: As Noober mentions below, having Field Surgeon is like having another HP of ablative armour. And with later better armours, it gets scales up from just 1 point. And if Field Surgeon fixes all wounds, you even get a Flawless screen.
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Note that a 2nd Field Surgeon doesn't always stack with the 1st. But if it does, that's great. Though might go with Interference on the 2nd non-officer Specialist. EDIT 4: Nope, Interference isn't worth it. Go for Field Surgeon or Covering Fire.
EDIT2: Aaaaaaaaaannnd after reading artifixer's comment, back to 2 Specialist builds, one Officer, one 2nd React/Medic Specialist. More details below.
For a while, was considering all Specialists Officer and 2nd to go with an OW/Medic build, but decided against it More details below of why I though it might work.
EDIT3: Another tweak to the OW Specialist. Going with Covering Fire. Discussion on Covering Fire from here on.
EDIT4: Playing with Grimy's Moral Mod. Vital to have Revival Protocol. Had 2 recent missions where the Specialist with Revival Protocol got shot and was bleeding out. Longer missions need 2 Specialist with Revival Protocol. Even if that means its on a OW Specialist. 3 builds.... Sigh.
Nope. If 2 Revival Protocol are needed for a long mission, take a 2nd Officer. There needs to be spares and ones for new Squads.
Specialist Officer
Revival Protocol - Field Surgeon - Medical Protocol - Ever Vigilant / Airdrop / Field Medic - Failsafe - Full Override - Restoration
Specialist React/Medic
Sentinel - Covering Fire - Medical Protocol - Ever Vigilant - Cool Under Pressure - Full Override - Restoration
LCpl: Revival Protocol vs Sentinel
Combat Protocol is good for getting rid of robots, but it can be replaced by fire from other troops.
I really like Revival Protocol. And I'm finding I often lose soldiers to Will breaking (I play with Grimy's Moral Mod) or Sectoid's Mindspin. Having Revival Protocol on the Specialist Officer will help to get them back into action faster. Otherwise, I would go with Sentinel for the 2nd Specialist. Especially as it can stop ADVENT yellow-alert attacks.
Cpl: Field Surgeon vs Covering Fire
Interference can be replaced by so many other things: damage, Flashbang, Suppression.
Soldiers will get wounded. Field Surgeon gets them back to health faster and can stack in effect. Having it on the Officer means it's always there. Covering Fire and Interference are interesting, but Field Surgeon is vital. A 2nd Field Surgeon may stack with the 1st, so I'd take it on the 2nd Specialist just for the chance of getting that. Interference is interesting though. Covering Fire is so-so and too situational in my opinion.
Sgt: Medical Protocol vs Trojan
Scanning Protocol is interesting, but soldiers will need healing and stabilizing and enemy robots will need hacking and breaking. There's other ways to scan. Trojan helps hacking, but Medical Protocol saves troops. Even Trojan can often be replaced by just shooting the disabled robot. Medical Protocol is close to a must-pick (along with carrying a medkit to give the GREMLIN 2 charges).
SSgt: Ever Vigilant vs Airdrop vs Field Medic
It would be nice to have Field Medic and add 2 charges to a medkit. But better to have Medical Protocol with a medkit and have those extra 2 charges carried by the GREMLIN. Airdrop is a nice way to get 2 Frag/Plasma Grenades and that could be more important.
But Ever Vigilant gives Specialists a free Overwatch if they just move. A must-pick for an Overwatch Specialist, close to a must-pick for other Specialists. Maybe Airdrop on non-overwatch builds.
TSgt: Failsafe vs Cool Under Pressure
Saviour buffs all healing abilities. But being able to Failsafe hack or improve the aim and crit of reaction shots will be better in the long run. I would go with Failsafe for the Specialist Officer and CUP for the 2nd Overwatch Specialist.
GSgt: Full Override
Whether Control Enemy or Master Enemy, having Full Override is vital against ADVENT robotic masses. Rescue Protocol and Threat Assessment are situational. Situations of masses of enemy MECs is more common. Combine with Redscreen Round shots and Grenadier Bluescreen-Bombs flashbangs.
For Full Override, it's not vital to have Failsafe as failing to hack a MEC isn't as serious as failing to hack a Tower or a Drone while the Squad is still concealed.
MSgt: Restoration
Being able to rally a battered team once per mission could make the difference. There's other ways to do the damage that Kill Zone and Capacitor Discharge would do. Might be interesting to check the other Perks out, but I think Restoration will be more likely to make a difference.