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I haven't used my deathwatch yet and I'm a bit uncertain on the rules. What would happen if a deathwatch unit with the mission tactics special rule is joined by an independent character like a GK Librarian, 1)Do only the deathwatch models get their re-rolls? 2) Does the GK Librarian get them too? or 3) Does no-one get re-rolls?

In the codex it says "The Mission Tactics special rule represents the unique way in which the Deathwatch go to war. At the start of your first turn, pick one of the following Mission Tactics. It will remain active for the entire battle unless you decide to change it as described below. As long as the Tactic is active, it affects all units in your army that have the Mission Tactics special rule."

In the deathwatch FAQ it also says "Q: An Independent Character from another Chapter can join another Chapter’s unit and confer its Chapter Tactics unless that unit also has a Chapter Tactics, in which case they cancel each other out. How does this work with Mission Tactics? Is it treated the same as Chapter Tactics?
A: You get neither."

As it says it affects "all units which have the mission tactics special" not "all units entirely comprised of models with the mission tactics special rule", I'm leaning towards option 1 as the unit has the special rule(inside of it), though I'm probably biased.
I don't really understand the question or answer for the FAQ, I don't play regular space marines so I don't know if these are like the normal chapter tactics or how it is that normal chapter tactics work. Any clarification would be appreciated cause I have no idea.

The FAQ says, "If you have an IC with Chapter Tactics, and it joins a DW unit that has Mission Tactics, then both rules do nothing."

This only affects you if a SM IC joins a DW unit.
In the case of a GK IC joining a DW unit, you will still get MT. However, I think that a DW IC joining a GK unit will not confer MT.

Thanks. But just to clarify, let's say a GK IC that joins a deathwatch unit e.g. a GK librarian joins a unit deathwatch veterans. Does the GK Librarian get the re-roll granted by the mission tactics special rule?

What's the wording on Mission Tactics? Does it have anything to make you think that models without the rule get to use the rule?

It's because it says "it affects all units in your army that have the mission tactics special rule" and when the GK IC joins a deathwatch unit they become one unit and they are in the same army. And the mission tactics special rule is within the unit, not all models have it but it is in the unit. I don't think it should allow the GK IC to use the re-rolls but RAW does he get them?

Also sorry for late response my internet went down.