Yeah, the BOPE is considered one of the most experienced urban combat units in the world, due to the nature of what they do. A lot of the tactics they pioneered have long since been adopted in Mexico, and many other Latin American countries dealing with heavily armed drug dealers.
I remember in "News from a Personal War", a BOPE officer was showing off an HK21 light machine gun, which is a weapon they've deployed on several occasions (HKPRO also has a photo of one of them with this gun). He pointed out that it's not a weapon that any American or European SWAT unit would ever use.
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