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Specialist Reaction
Cool Under Pressure - Revival Protocol - Suppression - Failsafe - Sentinel - Killzone - Full Override
Specialist Medic
Medical Protocol - Revival Protocol - Field Medic - Failsafe - Savior - Scanning Protocol - Restoration
The first one emphasizes the primary weapon skills. Revival and Failsafe are too important to leave out. The second is almost pure left-side medic, but again takes Failsafe as sometimes the medic will be the only Specialist.
I wonder if the Reaction Spec should also have Scanning Protocol. As well, I'm tempted to put Full Override on the Medic too, but I think a timely Restoration could safe a squad from certain peril.
A lot of people really like 3 Airdrop, but I think the other two skills for their respective builds are more important that just 2 more grenades.