Sarah Roberts was an enlisted Security Guard in Starfleet.
She had a normal upbringing on a small family farm that relied on irrigation canals from a nearby river, and enlisted in Starfleet in 2347.
Her first assignment was as a security guard at Starbase 18, serving in the Customs Enforecment Division. While abaord the station a smuggler was caught, pulled out a hidden disrupter and took a civilian cargo worker hostage. Instead of waiting for back up as the Chief of Security wanted, she retrieved a phaser rifle from a nearby weapons locker, then banked a heavy stun shot off the smuggler's ship and into his back.
While lauded for her actions,s he was quickly transfered to the USS Cooshee, in what was believed jealousy by her former department head. Still, she was awarded the Grankite Order of Tactics for her actions and attended Starfleet Marksmanship Training.
While stationed at Starbase 310 in 2358 she received advanced training in Cardassian ground force tactics. She would regularly be assigned to the Personal Security Details of diplomats metting with represenatives of the Cardassian Union. In 2368 she serving as a marksmanship instructor at Starfleet Academy.
One of her first assignments upon reporting to Gedna Tachion, before the escort was launched, was to take every crew member and have them qualify with both type II and type III phasers, starting with himself. This did not go over well with some.
During the Battle of Psellus Roberts was on standby in the Lionheart's transporter room with a heavily armed away team. She led the team in securing the Psellian Council Chambers when the ship reached orbit of Psellus III.