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That 55 is probably on the low side

I know the ultramarines are not the best example It I count 20 plus active capital ships before you add the star forts and Gloriana class battle ship

https://wh40k.lexicanum.com/wiki/Known_Vessels_of_the_Ultramarines

While a crew of 5 feels right for a strike cruiser I would have thought the bigger assets would warrant at least a full squad

Assuming the escort don’t have any marines on board your still looking at over 100 marines on full time fleet ops