What is "comsublant"

Commander, Submarine Force Atlantic (COMSUBLANT) is the Submarine Force U.S. Atlantic Fleet type commander under the United States Fleet Forces Command.

The principal responsibility of the Admiral commanding is to operate, maintain, train, and equip submarines. COMSUBLANT also has additional duties as commander of NATO's Allied Submarine Command and also Commander, Naval Submarine Forces. As Commander, Naval Submarine Forces (COMSUBFOR), an additional type commander role, he also supervises Commander, Submarine Force Pacific (often known as COMSUBPAC). From the 1960s to the 1990s the commander also held the NATO post of Commander, Submarines, Western Atlantic (COMSUBWESTLANT).