Here you'll find patches related to the C-2A but not to a specific squadron. I'll try to add some information or history if it is known.
One of the first patches related to the C-2A Grumman Greyhound was found by the VRC-50 in 1971. Collection of Dean Reynolds
For patches of the squadrons, please check the following pages: VRC-30 (Providers), VRC-30 DET 5 (NAF Atsugi), VRC-40 (Rawhides), VRC-50 (Foo Dog), VR-24 (Lifting Eagle), VAW-120 (Greyhawk), VAW-110 (Firebirds) and VX-20 (Airtevron)