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There's a couple of ways to do that:
1. You play Deathwatch where the 'non combat characters' are NPC's that they have to escort (that's even a suggested Mission type in the DW rulebook).
2. You play Dark Heresy with a Deathwatch Marine added in. The problem with that is twofold:
a. Deathwatch characters, obviously, are far far far far far above Dark Heresy characters. Like, ridiculously so. Now that makes sense - they are Marines after all - but they will over shadow the Dark Heresy characters in almost every aspect beyond interaction and investigation (and even then, a Marine PC can buff those areas, especially Dark Angels and Librarians).
b. If the other characters are specifically non-combat, then it will fall to the Marine to do all the fighting, and that may get boring for the other players (and even the Marine player).
As far as how the systems interact? They work fine. The rules for psychic powers are a bit different between the two games, but that won't really impact the rest of the experience. Everything uses the same D100 system, and the Skills/Talents/Traits are all pretty much the same across all three games (DH/RT/DW). I'd say that they are very compatible as long as you are aware of the stark differences in power levels between the three games (DH is low level, RT is mid level, DW is super-duper-epic level).
Hope that helps.
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