You take the role of Nick Farrel, a technical engineer in Delta Base - the complex that competes with Black Mesa in various research fields including exploration of the borderworld Xen and weapon development. Due to accidental entanglement of two different experiments conducted at the same time the infamous resonance cascade affects the Delta Base as well, bringing the hostile alien lifeforms which infest the facility very soon.
You don't have to include the Base part in the sign as its redundant. A Simple sign with Delta Research Facility would be perfect.
Great work!!!