Three types of 81mm mortar rounds: M374A2 (High Explosive), M375A2 (White Phosphorus) and M301A3 (Illumination). Taken from en-Wikipedia: <a href="https://en.wikipedia.org/wiki/Image:81mm-mortar-rounds.png" class="extiw" title="en:Image:81mm-mortar-rounds.png">en:Image:81mm-mortar-rounds.png</a>. Original description: :
For original context, please see <a rel="nofollow" class="external text" href="http://atiam.train.army.mil/portal/atia/adlsc/view/public/296765-1/fm/23-90/ch5.htm#s4">U.S. Army Field Manual 23-90: Mortars</a>.
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