Senior Agent is a rank used by several law enforcement agencies within the United States

United States

The United States of America is a federal constitutional republic comprising fifty states and a federal district...

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In particular, in the Louisiana Department of Wildlife & Fisheries - Enforcement Division

Louisiana Department of Wildlife & Fisheries - Enforcement Division

The Louisiana Department of Wildlife & Fisheries – Enforcement Division is the fish & game regulatory agency of Louisiana. It has jurisdiction anywhere in the state, and in state territorial waters. The agency enforces both state and federal laws dealing with hunting, fishing, and boating safety...

, it is a rank below Sergeant

Sergeant

Sergeant is a rank used in some form by most militaries, police forces, and other uniformed organizations around the world. Its origins are the Latin serviens, "one who serves", through the French term Sergent....

, yet above Agent

Special agent

Special agent is usually the title for a detective or investigator for a state, county, municipal, federal or tribal government. An agent is a worker for any federal agency, and a secret agent is one who works for an intelligence agency....

. This rank has no rank insignia. Agents who complete two (2) years of satisfactory or exceptional service are promoted to the rank of Senior Agent.

Usage in other agencies or countries may vary.