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So, I've played my Marines only once and it was Custom scenario, where they were used as Death Watch. I'm a total noob with Space Marines and because my english is not fluent (and I'm dumb when understanding rules), so I have a question that will probably make you wanna flame me.
I have a problem, I don't really understand how Doctrines works. I've read the 7th Edition SM codex and took a couple of looks into the 1d4chan, but it's still unclear to me when exactly do you issue a doctrine. I understand that, if you are Ultramarines and bring particular character and formation you can Issue doctrines twice per game (maybe 4?). Currently I'm playing an unnamed chapter until I finally decide what I wanna use them as. So let's say I have Space Marines, let's say they are Ultramarines. Rules says that: "An army that contains any Ultramarine units can use the Assault, Tactical and Devastor Doctrine once each per game. Its effects affect all Ultramarine models in your army". I already know their special rules that you can actually use it twice. Let's say I om other Chapter, rules says that ANY chapter can use one of this doctrines.

My general question is: If I'm not Ultramarines, I use one doctrine on my first turn - Tactical. Can I use my second turn, for example Devastator and on my Third to use Assault? Or I can only use only 1 type out of 3 doctrines only once for the whole game?

Also, Do I have to be in a formation to use Doctrines? If I play unbound army do I lose the opportunity to use Doctrine?

Many apologies for asking such ridiculous questions, but I'm really confused.

You can use each Doctrine you possess once. So if you have 2 Tactical Doctrines, 1 Assault Doctrine, and 1 Devastator Doctrine, you can use doctrines 4 turns, however 2 turns will be Tactical, one will be Assault and one will be Devastator.

You don't have to use a formation to use doctrines, however, the only way to get them Unbound is to be playing UM, as nobody else has basic access to them,

Thanks a lot for explaining this. So If I understand this correctly, IF I play anything that is not UM i have to be in Formation: Battle-Demi, or some other formation in order to use doctrines. If I go unbound I cannot use doctrines.

A Demi-company in an Unbound army will still get a Tactical Doctrine - detachments don't recieve Command Benefits in an Unbound army, but Formations still get their special rules.

But yes, unless you're Ultramarines, you don't get much access to Doctrines, only when they are specifically listed (such as the Demi-company).

 DalinCriid wrote:
Thanks a lot for explaining this. So If I understand this correctly, IF I play anything that is not UM i have to be in Formation: Battle-Demi, or some other formation in order to use doctrines. If I go unbound I cannot use doctrines.

Formations still work while Unbound.... Did you mean pure Unbound without Formations?

Charistoph wrote:

 DalinCriid wrote:
Thanks a lot for explaining this. So If I understand this correctly, IF I play anything that is not UM i have to be in Formation: Battle-Demi, or some other formation in order to use doctrines. If I go unbound I cannot use doctrines.

Formations still work while Unbound.... Did you mean pure Unbound without Formations?

Unbound as non-mixed or allied detachment. I just have 500 points of SM and nothing else.

Honestly, I feel like the SM book really needs a heavy FAQ for this particular thing.

Why are Doctrines not a basic rule for the army with benefits for Detachments/Formations?

 DalinCriid wrote:

Charistoph wrote:

 DalinCriid wrote:
Thanks a lot for explaining this. So If I understand this correctly, IF I play anything that is not UM i have to be in Formation: Battle-Demi, or some other formation in order to use doctrines. If I go unbound I cannot use doctrines.

Formations still work while Unbound.... Did you mean pure Unbound without Formations?

Unbound as non-mixed or allied detachment. I just have 500 points of SM and nothing else. [/quote

In that case either play a UM CAD, or don't worry about them and pick a chapter tactic that works for your collection.