The issue machete was serving with Americans long before the war - every tropical destination would see them, and the Philippines qualifies.
Also, Collins was pretty ubiquitous and shipped world-wide before the war.
Once hostilities began and the supply system kicked into gear, machetes were a staple of island fighting - again, the Philippines are an island chain - and they even found their way into the ETO - extant photos of Airborne sometimes show them - and they were a part of the AAF/USN survival kits, until they came up with the folding ones.
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