You would serve in starfleet as a Lieutenant. Your current assignment is in Security/Tactical.
Any of the following positions could be available on a Starship:
Security Systems Management
Torpedo Room Officer
Chief Weapons Officer
Behind every mission is the need to feel safe. Security personnel are always the first to arrive, and the last to leave. They understand that danger can come from any direction and are always prepared for the fight that may never come. Through this dedication, loyalty and attention to detail they give us this feeling of safety. We all appreciate this because underneath it is hope. The hope that we should all learn from our mistakes, face our fears and live long enough to appreciate the beauty the universe shows us every day.
Live long and prosper...take the Star Trek Personality Test