 The O 'Brien ships were also equipped with four twin 21 @-@ inch ( 533 mm ) torpedo tubes , for a total load of eight Mark 8 torpedoes . Although the General Board had called for two anti @-@ aircraft guns for the O 'Brien class , they were not originally outfitted with the weapons ; the later Sampson class was the first American destroyer class so armed . Likewise , there is no record of any of the O 'Brien ships being outfitted with mine @-@ laying apparatus . During World War I , most American destroyers were used in anti @-@ submarine warfare roles , and were equipped with depth charges and delivery systems , such as Y @-@ guns and depth charge racks . O 'Brien @-@ class ships were equipped with depth charges during the war , but no specific mentions of the types of depth charges used or delivery system are recorded in secondary sources . 
 The O 'Brien ships <a href='uninflect' title='1'><mark>were</mark></a> also equipped with four twin 21 @-@ inch ( 533 mm ) torpedo tubes , for a total load of eight Mark 8 torpedoes . Although the General Board <a href='been_done' title='2'><mark>had</mark></a> called for two anti @-@ aircraft guns for the O 'Brien class , they <a href='uninflect' title='3'><mark>were</mark></a> not originally outfitted with <a href='None' title='4'><mark>the</mark></a><a href='negative_concord' title='5'><mark>weapons</mark></a> ; the later Sampson class was the first American destroyer class so armed . Likewise , <a href='dey_it' title='6'><mark>there</mark></a> is no record of any of the O 'Brien ships being outfitted with mine @-@ laying apparatus . During World War I , most American destroyers <a href='uninflect' title='7'><mark>were</mark></a> used in anti @-@ submarine warfare roles , and <a href='uninflect' title='8'><mark>were</mark></a> equipped with depth charges and delivery systems , such as Y @-@ guns and depth charge racks . O 'Brien @-@ class ships <a href='uninflect' title='9'><mark>were</mark></a> equipped with depth charges during the war , but no specific mentions of the types of depth charges used or delivery system are recorded in secondary sources . 
The O 'Brien ships was also equipped with four twin 21 @-@ inch ( 533 mm ) torpedo tubes , for a total load of eight Mark 8 torpedoes . Although the General Board done called for two anti @-@ aircraft guns for the O 'Brien class , they was not originally outfitted w/ no weapons ; da later Sampson class was the first American destroyer class soo armed . Likewise , it ain't no record of any of tdaO 'Brien ships bein outfitted with mine @-@ laying apparatus . During World War I , most American destroyers was used in anti @-@ submarine warfare roles , and was equipped wiwittepth charges and delivery systems , such as Y @-@ guns and depth charge racks . O 'Brien @-@ class ships was equipped wiwittepth charges durin the war , but no specific mentions of the types of depth charges used or delivery system r recorded in secondary sources .