Gunner Rank is the 11th Rank in Online Ranked Match. In order to earn the Gunner Rank you need to keep a few things in mind.
You Need a Minimum of 4 players in a Lobby to earn Rank XP.
You Must Place in the Top 5 of the Match to earn big XP to Rank up.
You do not need to win to earn Ranked XP. Just the higher you are on the list the more you will earn.
Now below is a list of the Ranks from Recruit (Starter Rank) to Gunner.
Chief Petty Officer