Islamic Republic of Iran Navy
It is charged with the responsibility of forming Iran's first line of defense in the Gulf of Oman and beyond with the mission of acting as an effective blue-water navy. However, it is generally considered as a conventional green-water navy as it mostly operates at a regional level, in the Persian Gulf and Gulf of Oman but also as far afield as the Red Sea, the Mediterranean Sea and northwest quarter of the Indian Ocean. In July 2016, the Navy said that it would establish a presence in the Atlantic Ocean, of unspecified duration.
Jask
Jask is a port town, about south of Tehran,
situated on the Gulf of Oman. 
It serves as the capital of Jask County, and is the site of a base of the Iranian Navy which opened on October 28, 2008.
The base's position provides the Iranian Navy with the capability to close the Strait of Hormuz in order to block the entry of an "enemy" into the Persian Gulf. Admiral Habibollah Sayyari remarked on the base's opening that Iran was "creating a new defense front in the region, thinking of a non-regional enemy."