The Meteorology and Oceanography (METOC) Curriculum provides masters level education focusing on the science of the air and ocean environments their interaction and the application of the science to military operation support. The majority of the students in the program are US Navy Officers of the Oceanography (1800) Community. There are international students from a variety of other countries enrolled as well.
Students in the METOC program earn their Master of Science in Meteorology and Oceanography. This is not two separate degrees, but rather one degree combining the two related disciplines together into one joint degree. There is a fairly equal distribution of courses in the meteorology and oceanography departments that are taken. You can view a sample matrix of courses here (doc). At the mid point of their program, students choose which area they want to specialize in taking several elective courses and completing a thesis.
There is usually one quota for PhD students every year, alternating between the departments of Meteorology and Oceanography. Officers desiring to complete for these slots must apply to the Navy wide PhD program selection board. This PhD would be exclusively in Meteorology or in Oceanography depending on the quota for that year. The area of specialization in your Masters Degree does not limit which area you can earn your PhD in.
Although the courses are rigorous at the upper level, the curriculum is designed to accommodate students of various undergraduate backgrounds. Courses in undergraduate level topics are available and taken by those requiring them to ensure all students have the foundation from which to succeed.