I tend to run Deathwatch not as a Deathwatch squad, but as a squad from any other chapter of the groups choosing. I also tried starting them as new recruits into the Scout Company.

ACTIONS	ADVERSARIES	ALLIES
DEMEANORS	EQUIPMENT	FATE	IMPERIAL GUARD
IMPERIAL NAVY	IMPERIUM NORMA	SKILLS	SPACE MARINE CHAPTERS
SPACE MARINE SCOUT CHARACTER GENERATION	TALENTS	TIMELINE	TRAITS