While looking for information on HMMWV engines I found this.
The 82nd Airborne was testing this modification. More firepower than a Mrk-19 but still quite mobile.
http://www.militaryphotos.net/forums...ad.php?t=21404
Too large of an image to embed.
http://www.pica.army.mil/PicatinnyPu...news/HMMWV.JPG