In the locker room of Sector C's Anomalous Materials Lab visited in Half-Life, each locker bears the name of a Valve employee. The names include: * Casali, nod to Dario Casali. * Coomer, a nod to Greg Coomer. * Birdwell, a nod to Ken Birdwell. * Jones, a nod to Chuck Jones. * Guthrie, a nod to John or Mona Lisa Guthrie. Before the Resonance Cascade, the Black Mesa Announcement System in Sector C mentions him in the message "Dr. Guthrie, report to Inspection Lab 6 immediately.". After the Resonance Cascade, his locker is open; inside can be found two Glock 17 magazines on what appears to be an ammo box, as well as a US flag. * Riller, a nod to Dave Riller. Riller's name can also be found hidden in the Materials Transport, under a HECU outpost in the map "c2a2c". *