 O 'Brien was commissioned into the United States Navy on 22 May 1915 under the command of Lieutenant Commander C. E. Courtney , after which she conducted her shakedown cruise between Newport , Rhode Island , and Hampton Roads , Virginia . In fleet exercises off New York in November , O 'Brien collided with the destroyer Drayton , in a minor incident that carried away part of Drayton 's topmast and wireless gear . In December , she was assigned to the 5th Division , Torpedo Flotilla , Atlantic Fleet . From early 1916 @-@ spring of 1917 , she operated with the Fleet along the East Coast and in Cuban waters . 
 O 'Brien was commissioned into the United States Navy on 22 May 1915 under the command of Lieutenant Commander C. E. Courtney , after which she conducted her shakedown cruise between Newport , Rhode Island , and Hampton Roads , Virginia . In fleet exercises off New York in November , O 'Brien collided with the destroyer Drayton , in a minor incident <a href='null_relcl' title='1'><mark>that</mark></a>carried away part of Drayton <a href='null_genetive' title='2'><mark>'s</mark></a>topmast and wireless gear . In December , she was assigned to the 5th Division , Torpedo Flotilla , Atlantic Fleet . From early 1916 @-@ spring of 1917 , she operated with the Fleet along the East Coast and in Cuban waters . 
O 'Brien was commissioned into da United States Navy on 22 May 1915 under the command of Lieutenant Commander C. E. Courtney , after which she conducted her shakedown cruise between Newport , Rhode Island , and Hampton Roads , Virginia . In fleet exercises off New York in November , O 'Brien collided witt the destroyer Drayton , in a minor incident carried away part of Drayton  topmast and wireless gear . In December , she was assigned to the 5th Division , Torpedo Flotilla , Atlantic Fleet . From early 1916 @-@ spring of 1917 , she operated w/ tdaFleet along the East Coast and in Cuban waters .