Which of the following is not a characteristic of a Military Operations Area (MOA)?

A Military Operations Area (MOA) is specifically designated to allow for the training of military pilots and includes various military activities, including collective training exercises. These areas are important for ensuring that military training operations do not interfere with the operations of civilian aircraft, which is why they are established within specific airspace.

The identification of MOAs is consistent with aviation nomenclature practices; they are designated by a letter "M" followed by a number, such as "MOA 1". This helps pilots and air traffic controllers easily recognize and communicate about these special flight activities.

Thus, the assertion that a MOA is identified simply by the letter "M" does not fully capture the correct naming convention. Each MOA indeed includes a number following the "M", indicating its specific designation. Therefore, the correct answer emphasizes a fundamental aspect of MOA characteristics, ensuring clarity in identification and communication within aviation operations.