What is the full meaning of the acronym IRAC?

The acronym IRAC stands for "Interim Rapid Action Change." This terminology is used within military and aviation contexts, particularly regarding the process of implementing changes or updates to operations, procedures, or technical documentation that need to be made swiftly. The use of "Interim" highlights that these changes are to be put in place temporarily while more permanent solutions or revisions are considered or developed.

"Rapid Action Change" refers to the need for prompt attention to ensure that operations can continue safely and efficiently, minimizing the risk of outdated practices that could lead to safety issues or operational inefficiencies.

In this case, the correct definition encapsulates both the urgency and the temporary nature of the changes being made, aligning with the standards and procedures relevant to aircraft operations and maintenance, such as those associated with the MH-60S. The other choices do not accurately represent the official meaning within this context.