Seaman apprentice

Constructionman
variation

Fireman
variation

Airman
variation

Seaman
insignia

Collar
insignia
Seaman apprentice is the second lowest enlisted rank in the U.S. Navy, U.S. Coast Guard, and the U.S. Naval Sea Cadet Corps just above seaman recruit and below seaman; this rank was formerly known as seaman second class.
The actual title for an E-2 in the U.S. Navy varies based on the community to which the sailor belongs. Likewise, the color of their group rate marks also depends on their community.
Those in the general deck and administrative community are seamen apprentice. They wear white stripes on navy blue uniforms, and navy blue (black) stripes on white uniforms.
Hospital corpsmen are hospitalmen apprentice. They are the only rate in this community. They wear white stripes on navy blue uniforms, and navy blue stripes on white uniforms.
Those in the engineering and hull community are called firemen apprentice and wear red stripes on both navy blue and white uniforms.
Those in the aviation community are called airmen apprentice and wear green stripes on both navy blue and white uniforms.