Guys, I found these pics on militaryphotos.net:
http://www.militaryphotos.net/forums/showthread.php?t=70847As you scroll down the photos, you'll notice a Thai soldier lighting what appears to be a "Thunder" firecracker at the muzzle of a mortar to simulate firing a mortar round.
The photo comes with the caption: "For training that need only sound. (3 Baht each or just only 13 cent) Ha Ha Ha Ha" - posted by an individual who goes by the handle "Skyman".
Verympressive set of pictures if you ask me.
Sorry, haven't figured out how to post pics to this forum yet.