The U.S. Air Force is currently evaluating a shift in how it measures the readiness and composition of its aircraft fleet. Lt. Gen. David H. Tabor, the Deputy Chief of Staff, has publicly argued that the existing standard, known as the Primary Mission Aircraft Inventory (PMAI), is no longer sufficient for modern military requirements. According to Tabor, the PMAI metric fails to provide an accurate picture of the force's actual combat capabilities and resource needs.

To address these shortcomings, the Air Force is proposing a transition to a new metric: the Combat Coded Total Aircraft Inventory. Proponents of this change argue that the new system would offer a more realistic assessment of the fleet, ensuring that funding is directed toward aircraft that are actively prepared for combat missions rather than those held in reserve or used for training purposes. By updating this metric, the Air Force aims to improve its long-term planning and ensure that the fleet remains capable of meeting national security objectives in an increasingly complex global environment. While the proposal is framed as a necessary modernization of administrative oversight, it reflects broader concerns regarding how the military tracks its assets and justifies its budget requests to Congress.