From where would terrorists get naval shells?
What fires 155mm ammunition?
What is the most commonly-used explosive in IEDs found in Afghanistan?
I haven't been to Afghanistan but I would imagine terrorists get their supplies by arms trading and then shipping through the Pakistani border. That, or they are still sitting on the massive pile of weapons and ammo the Soviets left behind after the Afghan-Soviet war. We all know that the IED's in Iraq however, came from the munitions warehouses and the Iranian border.
(It's practically cheaper for world powers to build new weapons/ammo/vehicles than to ship them back home)
155mm is fired by artillery, tanks (more so self-propelled gun) and ships.
Ship:
http://www.navweaps.com/Weapons/WNGER_61-52_MONARC_Hamburg_pic.jpgTank:
http://homepage.eircom.net/~steven/images/auf1_cat8g.jpgI'd have no idea I only have second hand knowledge of 105's and 155's, there have also been reports of them using HME's and very rarely gas, poison and radioactive IED's (I would imagine these are built with the left over Depleted Uranium shells in Iraq due to the radiation on those bullets lasting 60 billion years but I would be willing to bet $20 that they aren't using thermite, C4, etc. I have also heard of the Taliban using anti-mobility mines on Abrams (what's used essentially when a tank can't be killed with mines and in modern warfare not many people have 8 hours of a day to bury four gigantic shells in the road). The mobility mines knock out the treads which, make the tank a sitting duck for 3-12 hours until things could be handled.
I can imagine why the americans are upset about the stryker however, these guys were lucky (
http://upload.wikimedia.org/wikipedia/en/1/1a/Size0-army_mil-44434-2009-07-10-090719.jpg ) but that bomb was very deep and under a large amount of concrete and still managed to flip the stryker.