Possible Clues:

• Football player at the beach?
• One providing security, in the main
• Maritime service
• Firm as model gets protection from maritime force
• The main service provider?
• One looking out for runners
• Shore-defense group
• Its academy is in New London, Conn.
• A tug's in distress? First ring Jack, maybe, about it? He'd help!
• Maritime force for defence, rescue, prevention of smuggling etc