COMMANDER
CHIEF OF OPERATIONS
LIEUTENANT COMMANDER
SECURITY CHIEF
LIEUTENANT
DETECTIVE
GROUND COMBAT
LIEUTENANT
J. G.
ARMED COMBAT
COMBAT SUPPORT
ENFORCEMENT
FIELD OPERATIONS
HAND-TO-HAND COMBAT
INTELLIGENCE
INVESTIGATOR
SHIP COMBAT
UNDERCOVER
ENSIGN
CRIME SCENE INVESTIGATION
CROWD CONTROL
CRYPTANALYSIS
EXPLOSIVES
FORTIFICATIONS
GROUND TACTICS
GUARD
HAND PHASERS
INGRESSION
JUDO
KARATE
MELEE WEAPONS
MOBILITY
RESCUE
WEAPON
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Security Department

Starfleet Security was a branch of Starfleet responsible for safeguarding the Federation from outside threats, and for conducting criminal investigations.--Starfleet Security - Memory Alpha

If your impulse upon encountering an interesting situation is to whip out your phaser and interpose yourself between your teammates and the "situation", then Security is the Department for you. Ensigns with a Security certification are ready to stand guard and patrol, provide tactical support on away missions, or assist in criminal investigations. Further certifications allow one to become a front-line combat officer or go undercover to investigate a criminal syndicate. This is the department of choice for those hoping to become the Security Chief of a starship and the division of choice for those who hope to become the Chief of Operations.

Command
Department
Starfleet
Academy
Federation
Species
Science
Department
Counseling
Department
Medical
Department
Engineering
Department
Operators
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Security
Department