I'd like to make a suggestion, why not make a beacon type missle for this instead of a command? Have a super hard to avoid missile, available at max guard rep, that spawn x amount of npcs to attack what its hit with? Would make carriers more rp to.
I feel this would make it more fair and less of a "GO KILL THEM ALL BS NPCS!!!1" kind of deal.
edit for something I just thought of
If this was implemented make the x amount of npcs all that said player could send in to attack, the device would have an absurdly long cooldown and once the target was dead or got away the npc would despawn