7. Prepare to the utmost detail for the employment of mines along our coast as may be necessary. 8. Prepare nets and other obstruction for submarines, ready for immediate use, at the Chesapeake Capes, Delaware Capes, entrance to New York Bay, eastern entrance to Long Island Sound, Narragansett Bay, Panama Canal, and Guantanamo. Other places as their need becomes apparent. The General Board considers it of the utmost importance that net protection shall be immediately provided for the fleet during its mobilization in Chesapeake Bay. 9. Establish immediately the guards at all navy yards, magazines, radio stations, powder factories, munition plants, bases, shipbuilding yards, and naval shore utilities in accordance with the mobilization plans. 10. Reduce the force of Marines in Haiti and Santo Domingo to the smallest number that can maintain order there, transferring these men to the United States to perform necessary guard duty at navy yards, magazines, radio stations, shipbuilding plants, and to form cadres for the organization of new regiments as recruits are obtained. Organize the advanced base force and complete its equipment. 11. Leave in the Caribbean a sufficient number of light cruisers to keep a lookout for submarines in those waters and for the protection of our interests there. Protect the Canal and Guantanamo as far as possible, by the use of mines and where possible by monitors, submarines and nets. 12. For the present use the greater part of the destroyer flotillas as patrol for submarines in the vicinity of the principal ports or entrances leading to them. 13. Base the submarines at Canal, Guantanamo, and points along the coast in accordance with the Black Plan. 14. Rush to completion all naval vessels building or authorized; also build up the Aviation Service as rapidly as possible. 15. Guard all bays and harbors on the coast of Maine to prevent their use as bases of supply. Patrol waters of Haiti, Santo Domingo, Porto Rico, and Danish West Indies, the Cuban Coast Guard Service to assist in patrolling all bays and gulfs of the coast of Cuba. 16. Prepare to close entrances to all ports at night and discontinue or change such aids to navigation as may be necessary. 17. Organize a comprehensive system of intelligence service covering the whole theater of war in accordance with the plans of the Office of Naval Intelligence. 18. Take possession of all interned vessels of war of Central Powers; also take control of all commercial vessels of Central Powers now in United States waters. 19. Place under surveillance all citizens of the Central Powers in the Navy or in Government employ in naval establishments, and remove them from positions in which they may do possible harm. 20. Arm our merchant ships for purposes of defense.