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Does the special rules for Space Marine Demi-Companies give units included (Devastators, Land Speeders, etc., not merely the Tactical Squads and their transports) objective secured?

I assumed originally that the core formation's rule only applied to the Tactical Squads, but others have tried to convince me otherwise.

Indeed it includes all units.
You can have OS Land Speeders!

Objective Secured is listed as a special rule for the formation, so it applies to the formation.

What made you think it would only apply to the tactical squads?

 FlingitNow wrote:
What made you think it would only apply to the tactical squads?

Probably the BRB CAD Command Benefits - Troops only got ObjSec.

Battle Demi-Company has own rules Special Rules, that grants ObjSec to every unit in Battle Demi-Company Formation.