Come on guys.
80% of the mag pouches these days are velcro.
When SOF units order special, purpose-built uniforms for bulk orders, they come with more velcro than the ACU.
TSSI, Paraclete, PROPPER, and others have made uniforms at the direct request of the sneakiest of the sneaky, and they have all kinds of velcro. And zippers.
As for who's wearing them? I've seen pics of everyone from HHC pukes to SF and Rangers wearing them overseas.
Sh*t, even Air Force SOF guys like TACPs, JTACs, and ROMADs are wearing Army ACUs because it's a superior uniform.