Infantry units can be similarly incorporated into the Army for greater efficiency and respect to them...just like the Air Force does not own the 82nd Airborne, there is no reason for the Navy to own the Marine units which end up fighting on land anyway.
The linked video references the unnecessary costs of the current separation, including unnecessary fighting and death, which happens only because the Marines often demand their own combat zones, and will accept unecessary or less strategic zones just to be "independent." The video also mentions the needless cost of integration with the Navy, and keeping infantry units at sea for extended periods...just not necessary any more.
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