Demoralizing Charge, available to commanders at 7th level, seems like far and away the strongest tactic for its level. Whereas Strike Now! is two actions for a MAPless Strike, Demoralizing Charge is two actions to let two allies move (possibly into a flank), Strike, and frighten.

>Demoralizing Charge [two actions]
>Brandish, Commander, Tactic
>Your team’s coordinated assault strikes fear into your enemies’ hearts. Signal up to two squadmates within the aura of your commander’s banner; as a free action, those squadmates can immediately Stride toward an enemy they are observing. If they end this movement adjacent to an enemy, they can attempt to Strike that enemy as a reaction. For each of these Strikes that are successful, the target enemy must succeed at a Will save against your class DC or become frightened 1 (frightened 2 on a critical failure); this is an emotion, fear, and mental effect. If both Strikes target the same enemy, that enemy attempts the save only once after the final attack and takes a –1 circumstance penalty to their Will save to resist this effect (this penalty increases to –2 if both Strikes are successful or to –3 if both Strikes are successful and either is a critical hit.)

The commander archetype lets any character pick this up at 8th level, though their commander class DC will probably be worse, and there will be no drilled reactions to soften the reaction cost for the allies.