All Navy Radiogram Concerning Recognition Signals
4 DN GH 35 Govt Fm Dn Washington Dc 20 Hp
Via New Orleans, La.
Naval Radio Pensacola:-
24 Alnav – To ships and stations with following code: The Secretary of War has issued orders to forts to consider hostile any entering men-of-war not showing recognition signal. These will be used always hereafter. Acknowledge 00021
Source Note: C, DNA, RG 45, Entry 517. Someone has handwritten “Radiogram” and “April 21, 1917” on this message.