Elite Units
From SSNTWiki
Many factions have unit that are considered elite. Elite units are usually better then most other unit in that they can fulfill a grater number of roles, or that they could fulfill some roles better then other generalist or even specialists.
To offset this, each elite unit will also require one additional command module, so the player is essentially sacrificing another unit slot to command each of them. They also have a very large reinforcement delay, making them priority for enemy battle groups. Many elite units can carry tactical weapons, making attacking them even higher priorities.
Most elite units can be removed by a well placed ambush by assassins, or by pinning them down using a cannon fodder, and then eliminated with tactical weapons.
