Indigo messages are used for which purpose?

• A. When needing authorization for fire
• B. For weather updates
• C. To log maintenance
• D. To file a travel plan

Answer: (A)

Indigo messages are the formal way to obtain authorization to fire. In weapons control, no rounds are fired without explicit approval carried by this type of message, making it time-sensitive and requiring confirmation from the designated authority. It ensures the correct chain of command is followed and that the engagement complies with rules of engagement and safety procedures. This is why it’s used specifically for authorizing fire, rather than for weather updates, maintenance logs, or travel plans, which use different communications and procedures. If you receive an Indigo message, treat it as a formal authorization to engage and respond according to your ROE and command instructions.