Squad

A squad is a military unit that in size and organisation below a platoon.

Breen Confederacy
A chedhn is the Breen equivalent of a squad and comprised of between 3 - 20 soldiers. 

Cardassian Union
A tekhasor was the Cardassian equivalent to a squad and was made up of around 8 soldiers commanded by a kel. 

Dominion
A squad in the Dominion is comprised of three Jem'Hadar. 

Klingon Defense Force
A Klingon Defense Force squad is approximately 5 warriors commanded by a noncommissioned officer or an officer of the rank of lieutenant or lower. 

Romulan Star Empire
A ter'val is the Romulan equivalent to a squad and was between 5 - 13 soldiers commanded by a sergeant or sublieutenant. 

Starfleet Ground Forces
A Starfleet Ground Forces squad is between 3 and 12 Starfleet soldiers and is typically commanded by an ensign or lieutenant JG. (LUG RPG: )

Starfleet Marine Corps
A Starfleet Marine Corps squad is between 3 and 12 Starfleet Marines.