MinRon is a standard U.S. Navy abbreviation for "Minesweeper Squadron."
The Commander of a Minesweeper Squadron is known, in official Navy communications, as COMMINRON (followed by a number), such as COMMINRON FOUR.
Mine Groups
A MinGru or MINGRU is a standard U.S. Navy abbreviation or acronym for "minesweeper group."
The Commander of a Minesweeper Group is known, in official Navy communications, as COMMINGRU (followed by a number), such as COMMINGRU TWO.
References
MinRon Wikipedia(Text) CC BY-SA