What designation is given to the HE round known as M889?

The M889 is designated as a high explosive (HE) round specifically designed for use with mortars. High explosive munitions are intended to produce a powerful explosive effect upon detonation, primarily through blast and fragmentation. This makes them effective in a variety of combat scenarios, particularly against enemy personnel and light vehicles. The designation as HE indicates its primary function and characteristics, signifying that it is designed for explosive impact rather than illumination or other effects.

In contrast, other choices relate to different types of rounds or designations that serve distinct purposes. For example, illumination rounds are specifically designed to light up a target area, while designations like FRTC and SRTC refer to specific training or tactical round categories, which do not apply to the M889. Thus, identifying the M889 as an HE round correctly recognizes its intended use on the battlefield, catering to its explosive capabilities.