[JasonC]

Probably just a particular light mountain model, wanted for Afghanistan. We have plenty of garden variety towed 105s and 155s.

[Darksheare]

It's the M-119A1 105mm light towed howitzer, max range 12000 meters, and 19,200 meters with RAP rounds.
Helicopter portable, and pulled along by an M-1097 Humvee usually.
The M-102 is considered obsolete and has been mostly replaced with the 119.
However, former Gerneal Eric Shinseki started off a plan to slash artillery units.
A plan that had been continued until recently.
Quite a few light towed artillery units were removed from service.
Oops.

Now they need them.