Escape the interrogation room by pushing the grate on the left wall. Take cover and let the patrol pass. Follow the straightforward path and avoid being seen by enemy patrols by taking cover as they pass.
After finding the second patrol, follow the hall to the right to find two guards. Take them out and follow the straightforward path as you engage and take out more enemies using your handguns. Continue fighting your way through several areas and hallways. The enemies are really weak and lightly armed so you shouldn't have problems dispatching them. Follow the stairs past the dogfighting arena to complete the section.