▁imped iment ▁to ▁expansion , ▁and ▁the ▁area ▁l angu ished ▁as ▁somewhat ▁of ▁a ▁back water . ▁This ▁continued ▁even ▁through ▁the ▁Rus so - J apan ese ▁War , ▁despite ▁Ma iz uru ' s ▁more ▁convenient ▁location ▁to ▁the ▁center ▁of ▁that ▁conflict . ▁In ▁the ▁post - war ▁period , ▁with ▁Korea ▁in ▁Japanese ▁hands , ▁and ▁the ▁thre ats ▁from ▁Russia ▁and ▁China ▁very ▁much ▁dimin ished , ▁there ▁were ▁discuss ions ▁about ▁closing ▁the ▁military ▁port . ▁Although ▁Ma iz uru ▁was ▁one ▁of ▁the ▁largest ▁military ▁ship y ards ▁in ▁Japan ▁( special izing ▁in ▁destroy er ▁construction ), ▁the ▁Washington ▁Naval ▁Tre aty ▁of ▁ 1 9 2 3 ▁also ▁consider ably ▁reduced ▁the ▁demand ▁for ▁war ship ▁construction , ▁and ▁its ▁facilities ▁were ▁largely ▁moth b alled ▁until ▁ 1 9 3 6 . ▁ ▁With ▁the ▁Pacific ▁War , ▁Ma iz uru ▁was ▁react iv ated ▁as ▁a ▁rec ruit ing , ▁training , ▁and ▁log ist ical ▁support ▁district . ▁It ▁was ▁also ▁a ▁base ▁for ▁one ▁of ▁the ▁Japan ' s ▁Special ▁Naval ▁Land ing ▁Forces , ▁and ▁a ▁Naval ▁Air ▁Station . ▁Ma iz uru ▁was ▁also ▁the ▁location ▁of ▁the ▁Imperial ▁Japanese ▁Navy ▁Engineering ▁Academy . ▁ ▁The ▁area ▁today ▁is ▁occupied ▁in ▁part ▁by ▁facilities ▁of ▁the ▁Japanese ▁Mar itime ▁Self - Def ense ▁Force , ▁which ▁has ▁preserved ▁a ▁portion ▁of ▁the ▁original ▁red ▁brick ▁gates ▁and ▁couple ▁of ▁buildings ▁as ▁comm emor ative ▁museum s .