Final Answer:
A technical directive issued by message or message format letter that dictates urgent dissemination is known as an Operational Immediate (OPIM) message.
Step-by-step explanation:
An Operational Immediate (OPIM) message is a form of communication used in military and technical contexts. It serves as a technical directive issued through a message or message format letter, emphasizing urgent dissemination. The term "Operational Immediate" signifies that the information contained in the message requires immediate attention and action. This type of communication is employed in situations where the timeliness of the dissemination is critical for operational effectiveness, security, or safety.
OPIM messages play a crucial role in military operations, where rapid and precise communication is paramount. The urgency associated with OPIM messages ensures that relevant parties receive and act upon the information promptly, contributing to the overall success and coordination of operations. The format and content of OPIM messages are carefully structured to convey the necessary details in a concise and clear manner, enabling quick comprehension and response.
In summary, an Operational Immediate (OPIM) message is a technical directive designed for urgent dissemination, commonly used in military and technical contexts to convey time-sensitive information and instructions.