Petty Officer First Class (PO1)

Private First Class (PFC)

Sergeant First Class (SFC)

Chief Petty Officer (CPO)

Master Chief Petty Officer (MCPO)

Master Chief Petty Officer of the Navy

petty officer (PO)

Senior Chief Petty Officer (SCPO)

command senior chief petty officer

duty petty officer

first fire mixture / first-fire mixture

petty warfare

field officer (field-grade officer / senior officer)

airman 1st (2nd, 3rd) class

class

class of supply

lead ship / name ship / class leader

military load class (MLC)

NATO Supply Class

Ohio-class submarine

ship class

class I A supplies (air/inflight rations)

class I supplies

class IX supplies (Repair parts and components)

class VII G supplies (Electronics)

class VII N supplies (Special weapons)

fume class

aggressive-class minesweeper

Astute-class submarine

forward class III supply point

aerodrome class

third-class road

CLASS I (< 150 KG) micro, mini or small drones