Correct me if I'm wrong, but for a little over two decades, MP5s in 9mm were the "go to" SMGs for hostage rescue with SOF forces around the world. A few reasons the switch was made in the U.S., was for a more common weapon system (M-4) and the 5.56mm caliber, which offered more lethality, regardless of barrel length, over the 9mm. It also streamlined logistics. The rest of the world, noticed what we did and followed suit. The MP5 series and other SMGs in 9mm, are still in use with some international & domestic SWAT teams, although currently, not so much.
For God and the soldier we adore, In time of danger, not before! The danger passed, and all things righted, God is forgotten and the soldier slighted." - Rudyard Kipling
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