senior chief petty officer

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A noncommissioned rank in the US Navy that is above chief petty officer and below master chief petty officer.
• noun One who holds this rank.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun US, Navy A non-commissioned officer in the United States Navy and United States Coast Guard, ranking above chief petty officer and below master chief petty officer.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a senior noncommissioned officer in the Navy or Coast Guard with a rank comparable to master sergeant in the Army