Christine J. Vale was a human female in Starfleet in the late 24th century.
She was born on Izar, where her mother was a peace officer. Vale followed in her mother's footsteps, becoming a peace officer in Pibroch City on Izar. In 2366, during an investigation of a double homicide, she was assisted by Lieutenant (j.g.) Domenica Corsi, deputy chief of security of the USS Roosevelt. Vale was inspired by Corsi's performance during the case to leave Izar and apply to Starfleet Academy.
Lieutenant Vale joined the crew of the USS Enterprise-E in 2375, and was promoted to Chief of security in early 2376, following the end of the Dominion War and the resignation of Lieutenant Padraig Daniels.
Late that year, she was promoted to Lieutenant Commander, and was offered the position of first officer of the USS Titan. She initially accepted, but stepped aside when former ambassador Worf returned to Starfleet. Following the death of Lieutenant Commander Data, however, it was decided Worf would remain aboard the Enterprise, and Vale was again offered the Titan posting, along with a promotion to Commander.
Vale was initially opposed to becoming Titan's exec over concerns that Deanna Troi's presence on Riker's senior command staff would impair his judgment. When Riker came to Vale for the third time to ask her to take the position, he pointed out that he was aware of the concern, and wanted her there to provide a voice of reason should his feelings for his wife cloud his decision-making.