Commander Danvers

Commander Lana Danvers is a Rivet City security guard and Harkness's second in command. She can often be found on the 2nd or 3rd level of the tower or in the Rivet City Marketplace after the Marketplace is closed

If Harkness can no longer fill that role, she becomes the chief of security and calls herself "Chief Danvers" in conversation. Danvers may take Harkness's place in the Rivet City Council, but is also know to refer to Harkness as the current seat even after he has left.

She is the daughter of the founding Rivet City Council member Brad Danvers. Among Danvers' possessions are Danvers' Key and an Armory Key. She wears Rivet City Security Uniform (sans helmet) and totes a Combat Shotgun.

Related quests
You may need to speak with her to complete the Council Seat quest involving Bannon and Seagrave Holmes. If you kill her you may not be able to complete the unmarked quest, and hereby lose the option for gaining the schematic for the Deathclaw Gauntlet.

Bugs

 * If during The Replicated Man quest you sided with Harkness, asked if you could kill Dr. Zimmer yourself, then told Dr. Zimmer about Harkness to get both rewards (then killed Dr. Zimmer) Lana Danvers believes she is the Chief of security, although Harkness still is too.
 * The bug stated above has also been encountered when the player ended The Replicated Man by lying to Dr. Zimmer after talking to Harkness, Lana was found in the marketplace at night and talked as if she was head of security now. Note this only occurs if you have not yet spoken to Commander Danvers before beginning this quest.