Final answer:
A Master Chief Petty Officer wears three gold chevrons on their sleeve to represent their years of service. They also wear a rating badge indicating their field of expertise.
Step-by-step explanation:
A Master Chief Petty Officer wears three gold chevrons on their sleeve. Each chevron represents 12 years of service. So, a Master Chief Petty Officer with 36 years of service would have three chevrons. In addition to the chevrons, a Master Chief Petty Officer also wears a rating badge indicating their field of expertise, such as a blue anchor for a Boatswain's Mate or a red cross for a Hospital Corpsman.