Lieutenant Commander
Silver Woodpecker tail
Leader of a frigate 
Leader of a battleship's sector

Commander 
Silver Honeyguide tail
Leader of a battleship   

Ensign   
Bronze  Snipe tail
Corvette specialist

Lieutenant   
Silver Gull tail

Leader of a corvette

Leader of a frigate's sector
Leader of a battleship's squad

Below these were cadets, which were not considered a rank, and who wear no insignia.