Summary: Fairfax County Fire and Rescue units, including Ambulance 440 and Engine 417, were dispatched on Channel 4 (Bravo, Fox 417-13) to respond to an EMS Level 3 medical emergency at 13605 South Springs Drive, near the cross street Sandstone Way. Multiple units confirmed their response and coordination was maintained over the radio. The incident involved a request for additional support and confirmation of readiness from the responding ambulance.