Mortars & artillery are a problem for the Green Zone in Iraq - DoD developed a land-based version of the US Navy's Phalanx anti-missile system for this. Officially it's known as C-RAM, but it's also called "R2D2" by some... videos of it on Youtube are.. interesting. Someone described it as being very LOUD - like your dentist using a chainsaw:
C-RAM Shot in Iraq
http://www.youtube.com/watch?v=u5mQk-q6Uv4
CRAM during Mortar Attack
http://www.youtube.com/watch?v=94BRkbFbITY
Phalanx (CIWS) Block 1B LPWS Testing and Firing
http://www.youtube.com/watch?v=cgpQBZF2sZQ
Navy version videos:
http://www.youtube.com/watch?v=T4hA8IqSC58
http://www.youtube.com/watch?v=S2R4XAz193U
http://www.youtube.com/watch?v=wWS-z2hwM14
http://www.youtube.com/watch?v=18G5ycZf-rc
For more Counter Rocket, Artillery, and Mortar (C-RAM) background, see
http://en.wikipedia.org/wiki/Counter-RAM
http://www.globalsecurity.org/military/systems/ground/cram.htm
C-RAM Shot in Iraq
http://www.youtube.com/watch?v=u5mQk-q6Uv4
CRAM during Mortar Attack
http://www.youtube.com/watch?v=94BRkbFbITY
Phalanx (CIWS) Block 1B LPWS Testing and Firing
http://www.youtube.com/watch?v=cgpQBZF2sZQ
Navy version videos:
http://www.youtube.com/watch?v=T4hA8IqSC58
http://www.youtube.com/watch?v=S2R4XAz193U
http://www.youtube.com/watch?v=wWS-z2hwM14
http://www.youtube.com/watch?v=18G5ycZf-rc
For more Counter Rocket, Artillery, and Mortar (C-RAM) background, see
http://en.wikipedia.org/wiki/Counter-RAM
http://www.globalsecurity.org/military/systems/ground/cram.htm