▁a ft ▁of ▁the ▁super structure . ▁ ▁The ▁power - gener ation ▁system ▁could ▁send ▁current ▁through ▁this ▁split ▁tail ▁after ▁it ▁was ▁stream ed ▁behind ▁the ▁ship , ▁creating ▁a ▁magnetic ▁field ▁designed ▁to ▁set ▁off ▁magnetic ▁mines ▁after ▁the ▁ship ▁passed ▁over ▁them . ▁ ▁It ▁carried ▁conventional ▁mine - s we eping ▁g ear ▁as ▁well . ▁ ▁Pacific ▁Ocean ▁operations ▁▁ ▁After ▁sh aked own , ▁Le ader ▁joined ▁Mine ▁Squadron ▁ 9 ▁at ▁Long ▁Beach , ▁California , ▁ 2 1 ▁December . ▁During ▁ 1 9 5 6 , ▁she ▁performed ▁mine ▁evaluation ▁exer cis es ▁and ▁tact ical ▁training ▁until ▁ 1 ▁October ▁when ▁she ▁depart ed ▁on ▁her ▁first ▁West P ac ▁cru ise . ▁Ar riv ing ▁Y ok os uka ▁ 3 0 ▁October , ▁she ▁operated ▁with ▁the ▁U . S . ▁ 7 th ▁Fle et ▁for ▁the ▁next ▁ 5 ▁months ▁performing ▁mine ▁war fare ▁exer cis es ▁in ▁the ▁Far ▁East . ▁Return ing ▁home ▁ 1 2 ▁April ▁ 1 9 5 7 , ▁the ▁mines we eper ▁res umed ▁mine ▁evaluation ▁tests ▁along ▁the ▁U . S . ▁West ▁Coast ; ▁and ▁she ▁continued ▁these ▁operations ▁for ▁the ▁next ▁ 2 ▁years . ▁ ▁Camb odia ▁and ▁Vietnam ▁operations ▁▁ ▁From ▁ 1 9 5 9 ▁through ▁ 1 9 6 8 ▁Le ader ▁altern ated ▁six ▁West P ac ▁cru ises ▁with ▁U . S . ▁West ▁Coast ▁mine ▁war fare ▁and ▁mine ▁counter measure