SOooooooo....... I''ve got into an interesting conversation on one of the facebook groups for 40k and i thought i'd pose the same question here to see what response you guys give.
looking the two formations within the Ed7 rule book (p120) it outlines both the combined arms detachment (standard 1 HQ, 2 troop choice) and the Allied Formation (1HQ and 1 Troop choice) allow you to gain the 'objective secured' special rule.
If you do not run either of these formations then you do not benefit form this ruling and it reverts back to the controlling objective markers on page 134 where you only hold an objective marker if it is contested.
So what if you have a troop choice as part of a formation? That formation is not part of the detachment as it is classifed as a completely seperate detachment so does not benefit from Objective secured.
This came about as the Skitarii do not have a HQ choice so therefore cannot benefit from being a Allied formation, they run a diffeering formation called the Skitarii Municiple (which gives them scout and crusader) however as the rangers and vanguard are troop choices could they ever get objective secured.
I came to the conclusion that they can't but i'd be keen to hear your opinions?