1945年1月,第20轰炸机司令部开始准备重新部置至马里亚纳群岛。该部停止采用在中国境内基地加油后轰炸日本和东亚其他目标的战术,改为打击过去需从克勒格布尔出发袭击的东南亚目标。克勒格布尔周边的工业目标很少,所以第20轰炸机司令部的首要任务改为攻击仰光、曼谷和新加坡主要港口及其他小港口的航运,攻击手段除常规轰炸外,还包括布置水雷。部队转移期间,李梅于1月18日离开马里亚纳群岛,罗杰·拉姆西(Roger M. Ramsey)准将接掌第20轰炸机司令部。[22]
第20轰炸机司令部转移后,英国皇家空军第222联队(No. 222 Group RAF)使用B-24解放者重型轰炸机继续在新加坡附近布雷[35][36]。布雷作业在5月24日中止,以免水雷影响原定九月执行的“拉链行动”(Operation Zipper)[37]。日军在新加坡海峡各岛屿设立观察哨搜寻雷区,但基本不起作用,往往是在船只撞到水雷后才发现雷区。新加坡附近共有三艘船被空中投掷的水雷炸沉,另有十艘受损。此外,雷区还扰乱日本的护航路线,妨碍舰船修复。[38]整体而言,盟军的布雷作业持续时间太短,不足以决定战局[34]。
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