Why does the armband of the Chinese Marine Corps say Navy instead of Marine Corps?

The armband of the Chinese Marine Corps reads "Chinese Marine Corps".

The armband worn by the Chinese People's Liberation Army Marine Corps is round with a black background and a yellow circle. The pattern in the middle consists of military emblem, wheat ear, iron anchor, sword and dagger. As shown in the figure below:

In addition, the PLA Marine Corps is a branch of the navy. It is an amphibious combat force composed of various arms, which can implement rapid landing and undertake coastal and island defense or support tasks. It is a fist to deal with local wars and military conflicts, and also a "sharp knife" in joint offensive operations, which plays an important role in modern wars. Since the establishment of 1 Marine Corps in 1953 and 1 Marine Corps Brigade in May 1980, the Chinese Marine Corps has now developed into a rapid-response amphibious combat force, consisting of amphibious scouts, marine infantry, armored soldiers, artillery, missile troops, airborne troops, anti-chemical troops and communications.

The following is the PLA navy armband:

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