What is the definition of a fragmentary order?

A fragmentary order, often abbreviated as "FRAGO," is defined as an order used to modify existing orders. This type of order is crucial in military operations as it allows for quick updates and changes to ongoing missions without the need to reissue a complete order. It aids in maintaining the flexibility necessary in dynamic environments where situations can change rapidly, and commanders need to convey essential updates to their units swiftly.

The essence of a fragmentary order lies in its ability to communicate modifications to a situation or mission that is already in progress. It retains the context of the overarching mission while adapting to new intelligence or operational conditions. This function is essential for effective command and control, ensuring that all personnel have the most current information they need to execute operations successfully.