merchant shipping it is requested that secrecy be observed in all matters of—
1. Advance information of the routes and schedules of troop movements. (See Par. 5.)
2. Information tending to disclose the number of troops in the expeditionary forces abroad.
3. Information calculated to disclose the location of the permanent base or bases abroad.
4. Information that would disclose the location of American units or the eventual position of the American forces at the front.
5. Information tending to disclose an eventual or actual port of embarkation; or information of the movement of military forces toward seaports or of the assembling of military forces at seaports from which inference might be drawn of any intention to embark them for service abroad; and information of the assembling of transports or convoys; and information of the embarkation itself.
6. Information of the arrival at any European port of American war-vessels, transports, or any portion of any expeditionary force, combatant or non-combatant.
7. Information of the time of departure of merchant ships from American or European ports, or information of the ports from which they sailed, or information of their cargoes.
8. Information indicating the port of arrival of incoming ships from European ports or after their arrival indicating, or hinting at, the port at which the ship arrived.
9. Information as to convoys and as to the sighting of friendly or enemy ships, whether naval or merchant.
10. Information of the locality, number, or identity of vessels belonging to our own navy or to the navies of any country at war with Germany.
11. Information of the coast or anti-aircraft defenses of the United States. Any information of their very existence, as well as the number, nature, or position of their guns, is dangerous.
12. Information of the laying of mines or mine-fields or of any harbor defenses.
13. Information of the aircraft and appurtenances used at government aviation-schools for experimental tests under military authority, and information of contracts and production of air material, and information tending to disclose the numbers and
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