As the cascading blue shimmer of the transporter beam dissolved into the air of Transporter Room 3, Ensign Demi Ripley stepped off the circular pad. Her boots hit the deck plates with a heavy, deliberate thud—a habit of a line Marine accustomed to checking her footing on unstable planetary terrain. She adjusted the crisp, gold-commanded collar of her Starfleet Security uniform. It felt remarkably light compared to the standard-issue ballistic matrix armor she had worn as a Sergeant in the Marine Corps. Too light. It made her feel exposed.
​”Welcome aboard the Sentinel, Ensign,” the transporter chief said, offering a polite nod from behind the control console.
​”Thank you, Chief,” Demi replied. Her voice carried the low, gravelly cadence of someone who had spent the last several years shouting over atmospheric displacement fields and mortar fire. She picked up her single duffel bag, slung it over her shoulder, and walked toward the exit.
​The doors hissed open, revealing the narrow, utilitarian corridors of the Independence-class frigate. The U.S.S. Sentinel was built for exploration, but its compact design meant every inch of space was maximized. Pipes and data conduits ran along the upper bulkheads, humming with the steady, vibrant pulse of the warp core deep below.
​As she navigated the corridors toward Deck 3, Demi found her eyes instinctively mapping the environment. Choke point at the junction. Bulkhead doors are reinforced duranium—good for sealing off atmospheric decompression, bad for a rapid retreat if overrun. No visual blind spots for internal sensors. It was a hard habit to break. You don’t just stop being an infantry operator because Starfleet handed you a commissioned rank and a clean pair of trousers.
​She passed a pair of junior crewmen who snapped their eyes toward her, noticed the single smooth braid of an Ensign on her sleeve, and stepped aside to give her room. Demi almost raised a hand to return a non-commissioned salute before she caught herself. Right. I’m the officer now. The thought felt strange, almost foreign, sitting heavily on her chest.
​Turning a final corner, she arrived at the automated doors of the primary medical section. The digital placard beside the frame glowed steadily: SICKBAY — MANDATORY ONBOARDING COMPLIANCE.
​Demi took a brief, centering breath, squared her shoulders to her full five-foot-ten height, and stepped forward. The doors slid apart, exposing her to the bright, sterile white light of the Sentinel’s medical ward and the low, rhythmic chiming of the biobeds waiting inside.

Ensign D. Ripley Security
Uss Sentinel Ncc 1911