Operation Graphic Hand

Operation Graphic Hand was an execution of an augmentation plan designed to augment the US Post Office in response to postal strikes. The National Guard was called into federal service to suppress insurrection, unlawful obstruction or rebellion, conspiracy, and infringements of civil rights and to repel invasion or execute the laws under the legal authorities of 10 USC 331, 332, 333, 3500, and 8500.

Selective mobilization is an expansion of active duty forces in response to a peacetime domestic crisis. The President, or Congress, upon special action, may order expansion of the active duty forces by mobilizing units and individuals of the Selected Reserve to protect life, federal property, and functions or to prevent disruption of federal activities. An example of this authority was in early 1970 when Reserve Component units were mobilized as part of Operation Graphic Hand.