VMF(N)-531 GCI Detachment
The VMF(N)-531 GCI Detachment was a short-lived aviation command and control unit that was part of the United States Marine Corps's first night fighter squadron, VMF(N)-531. This detachment was the Marine Corps' first dedicated GCI detachment utilized in a combat zone.
Source: Wikipedia — VMF(N)-531 GCI Detachment (CC BY-SA 4.0)