There may well be ex-Seals on board either vessel but performing other duties. During my brothers 20 years in the service, he knew some ex-Seals who were also trained as machinist mates. There were others in other capacities as well. He said that they were dual trained so that they could operate not only as a Seal but in other duties as required by the Navy (radar technician, machinst mate, electrician, etc).