Why does the Chinese Marines' armband say Navy instead of Marine?

The Chinese Marine Corps' armband reads "Chinese Marine Corps".

The People's Liberation Army (PLA) Marine Corps personnel wear a round armband with a yellow circle on a black background, and a design in the center that consists of the military insignia, ears of wheat, an iron anchor, a sword and a dagger. The following picture:

In addition, the People's Liberation Army Marine Corps (PLA Navy Marine Corps) is a branch of the Navy, which is a plurality of military branches synthesized to be able to implement the rapid landing and undertake coastal, island defense or support tasks of amphibious combat troops, is to cope with local wars and military conflicts fist, and joint offensive operations of the "sharp knife", in modern warfare plays a significant role. China Marine Corps since 1953, the formation of the 1st regiment of land combat, since May 1980, the establishment of the 1st brigade of land combat, has now developed into a amphibious combat force capable of rapid response by amphibious reconnaissance, land combat infantry, armor, artillery, missiles, airborne troops, chemical defense, communications, engineers and other branches of the synthesis of amphibious combat forces.

The following are the armbands of the Chinese People's Liberation Army Navy: