Vertical axis of JROTC bars is parallel and centered between the outer edges of the coat ______.

The vertical axis of JROTC bars is parallel and centered between the outer edges of the coat collar. This specification is important for maintaining a uniform appearance and ensuring that the insignia is displayed correctly. The collar serves as a prominent point on the uniform, making it an ideal location for the placement of bars. When positioned correctly, the bars enhance the overall aesthetics of the uniform while also symbolizing rank and achievement within the JROTC program.

Other areas of the coat, such as the lapels, pockets, or buttons, do not provide the same structured and standardized location for insignia, which is why they are not the correct choices for this question. The collar's design and placement on the uniform provide the necessary guidelines for ensuring consistency across all cadets in the program.