What are these rank represent in the Gate OP scene? So recently I just hook up this anime called Gate or Jieitai Kanochi nite and in the opening scene is very "fire" but I found that there's something kinda attracted me. It's the army rank. What are these rank called?
Those are ranks of the JSDF's Ground Self-Defense Force. These are the ranks of the member's of Itami's Third Recon Team, briefly shown in the first OP.

From Wikepedia: 


陸士長 (Rikushichō) Leading Private 
3等陸曹 (Santō rikusō) Sergeant 
2等陸曹 (Nitō rikusō) Sergeant First Class 
(left to right) 陸曹長 (Rikusōchō) Sergeant Major and 1等陸曹 (Ittō rikusō) Master Sergeant  
2等陸尉 (Nitō rikui) First Lieutenant