Summary: Units including Engine 415, Medic 415, and Battalion 403 were dispatched to a cardiac arrest incident at 3925 Downs Drive, Arbor Terrace, Fairfax County, Virginia. The call was assigned to Box 41513 and classified as an EMS Level 1 response. The incident location was further identified near Cross Street and Birch Drive. Multiple transmissions confirmed the nature of the emergency and the responding units.