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There are two detachments in the main rulebook that are useable by any Faction, but cannot actually be used by 2 (Imperial Knights and Inquisition) as they do not have Troop selections. Instead, they come with their own detatchments (using 6th edition terminology, 'force organization charts') which can be used instead of, or in addition to, the 2 presented in the rulebook. (7th edition codexes are also arriving with unique detachments - Orks, GK's etc.).
Check out page 122 of the rulebook for the differences between a Combined Arms Detachment (the 'default' / 'ordinary' / 'FOC' detachment) and an Allied Detachment (main restriction is that it can't be the same Faction as your Primary Detachment).
Some examples of legal battle-forged armies:
One CAD (Primary - Space Marines - Ultramarine Chapter Tactic, 1 HQ, 2 Troops), one Allied Detatchment (Dark Angels, 1 HQ, 1 Troops), one Inquisition Detachment (1 Inquisitor, 1 Warband).
One CAD (Primary - Dark Angels, 1 HQ, 2 Troops), one CAD (Chaos Space Marines, 1 HQ, 2 Troops), Tau Fire Support Cadre Formation (1 Riptide, 3 units of Broadsides).
Three Inquisition Detachments (Each 1 HQ, one is the Primary), Allied Imperial Knight Detachment (1-3 Knights).
Primary IK Detatchment (1-3 Knights), Inquisition Detachment (Each 1 HQ), 2x Imperial Assassin Dataslates, Legion of the Dammed Detachment (1 unit of LotD).
{Edited, cheers Happy}
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