Which nomenclature corresponds to the collimator in artillery systems?

The nomenclature that corresponds to the collimator in artillery systems is M1A2. The collimator is a crucial optical device used to align the firing apparatus of artillery, ensuring accuracy in targeting. The M1A2 specifically serves this purpose by providing a means to align the artillery sights with the intended line of fire.

This specific nomenclature is well-regarded in artillery systems due to its effectiveness and reliability in ensuring projectile accuracy. Understanding its function is critical for ensuring that artillery personnel can perform their duties without discrepancies in aiming due to misalignment. The other nomenclatures listed—M137A2, M90A3, and M137A1—refer to different components or systems within artillery deployments, but they do not pertain to the collimator. Thus, the M1A2 stands out as the correct choice for this particular function within the artillery framework.