A squad is a military unit, usually consisting of eight to fourteen infantry soldiers.
The MACO squad assigned to the Enterprise NX consisted of more than sixteen soldiers and was commanded by a major. Captain Archer suggested to Erika Hernandez that she have a squad aboard the Columbia NX-02. (ENT: "Home")
Klingon Birds-of-Prey contain at least one squad, which consist of at least five soldiers. (ENT: "Borderland")