Were the Americans’ proximity fuses in use in the Pacific Theater?
Yeah. I remember reading some time ago that they were using them off ships in the Pacific against Japanese aircraft. They were less leary of using them there than in the ETO, and used them earlier if I recall, because there was less danger of the new technology falling into the hands of the enemy. That being the case, it’s hard for me to imagine that our ground troops in the Pacific were not using them against the Japs by this point in the war.
http://www.westpoint.edu/history/SiteAssets/SitePages/World%20War%20II%20Pacific/ww2%20asia%20map%2050.jpg