The U.S. Marine Corps leads a charmed life in the budget battles in Washington D.C, with powerful allies in Congress. The result is that what the Corps wants, it gets.
A small example can be seen in the Marines' small fleet of operational support aircraft (OSA), which I would call something akin to air taxis for generals.
The OSA fleet includes a dozen each of UC-35D (Cessna Citation Encore) jet aircraft and UC-12W (Beechcraft 350 King Air) turboprop aircraft. The Marines plan to replace the UC-35D jets with more UC-12W turboprops. Probably slower but just as comfortable.
Marine Corps OSA aircraft are fitted with defensive systems, visible in the photos near the nose and tail.