As a medic this discussion is a bit out of my lane. But I must said I thoroughly enjoyed the level of detail and discussion that's going on here. Solid Stuff.
It reminded me of a video I saw and I thought was worth sharing. The Japanese, back in WWII saw the effectiveness of having such a rapid deploy indirect fire weapon. Type 89 "Knee Mortar", Simple setup and deployment, ingenious method of adjusting the range of the projectile. Weapon was always aimed and at a 45degree angle, with the range adjustment being made by a quick adjustment of the depth of the grenade/mortar in the tube. Apparently used to Good effect in an age where the next quickest option was a tedious to load rifle grenade.