Wow, it sure is hard to keep a thread on topic!
As a former operations planner, I will say this: All branches should have a say on elements of another service's operations
that affect them, but each branch's
strategic role is fundamentally different. I was an Army planner, through and through, so, even though I have worked in Joint environments, my depth of knowledge of Navy operations is a couple of inches deep, yet even I know that Naval Operations are much, much broader than simply moving Army troops and supplies around. Naval power is an important - and separate - element of the
National Defense Strategy.
Navies are,
strategically, a force projection platform. Naval operations include, especially, "freedom of the seas" operations, which are of vital national interest. They also include "Treaty Enforcement" operations - which
Godric addressed (but largely incorrectly). It is one of the trickiest aspects of international law, but it is not without legal basis or justification. Nor is it correct to call the Chinese Navy a joke. As an international strategic force, it is nascent, but it is far from irrelevant. The PLAN has been conducting anti-piracy operations essentially continuously since 2008 in the Gulf of Aden, and has strategic port operations in Myanmar, Sri Lanka, Pakistan and Iran. In addition, China has extensive experience and resources in international shipping operations.
There had been a lull, following WWII, in the external projection of force from a Chinese Navy (People's Liberation Army Navy or PLAN - isn't that an oxymoron), but that is the past.
Until the late 1980s, the PLAN was largely a riverine and littoral force (brown-water navy). However, by the 1990s, following the fall of the Soviet Union and a shift towards a more forward-oriented foreign and security policy, the leaders of the Chinese military were freed from worrying over land border disputes. Having traditionally been subordinated to the PLA Ground Force, PLAN leaders were able to advocate for a renewed attention towards the seas.
In 2008, China confirmed plans to operate a small fleet of aircraft carriers in the near future, but for the purpose of regional defence as opposed to "global reach".[7] By 2009, with the advancements in naval techonology, the PLAN was recognized to have reached the status of a
green-water navy.[8] Chinese military officials have also outlined plans to operate in the first and second island chains, and are working towards blue water capability.[9] Chinese strategists term the development of the PLAN from a green-water navy into "a regional blue-water defensive and offensive navy."[10] The People's Liberation Army Navy (PLAN) plans to have at least 6 aircraft carriers by 2035.[11][12]
(
Wikipedia, citing US Naval planners and resources).
[There are, essentially, 3 "tiers" of naval operations, colloquially referred to as "Brown-water" which consists of internal waterways and littoral areas of the country (think Coast Guard), "Green-Water" which expands to "regional control", and "Blue-Water" navies, which can project power anywhere in the world for extended periods of time.]