From Lexicanum

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The Command Squad is there to join a member of the HQ as its bodyguard, but also functions as a rallying point with several specialist units. A Command Squad is made up of an Apothecary and four Veteran Marines armed with Boltguns or Bolt Pistols and Close Combat Weapons, Frag Grenades, Krak Grenades. Two of the members can be armed with following weapons, Heavy Bolter, Missile Launcher, Multi-melta, Plasma Cannon, Lascannon, Flamer, Meltagun or Plasma Gun.

Most of the time three of the Space Marines act as:

• Apothecary - armed with a Narthecium and Reductor
• Company Standard Bearer - carrying a Company Banner
• Company Champion - Power Weapon, Combat Shield and Bolt Pistol

It is not uncommon for Space Marine Command Squads to be mounted on Space Marine Bikes if the commander they are guarding is mounted on one. The command squad may be outfitted with specialist gear such as melta bombs or storm shields, and may take a dedicated transport such as a Rhino or Razorback.

Sources

• Codex: Space Marines (5th Edition)

Space Marine Infantry

Command	Master • Captain • Master of Sanctity • Reclusiarch • Epistolary • Codicier • Command Squad • Apothecary • Company Standard Bearer • Company Champion
Standard	Tactical • Assault • Devastator • Scout • Veteran • Tyrannic War Veterans • Honour Guard
Terminators	Terminator Squad • Terminator Assault Squad • Terminator Command Squad