Actually C4 is a common military explosive around the world. A lot of Western/Westernised countries use it. A bit like Semtex was in the old Eastern Block.

However, like everything else, when you break it down under analysis you can actually tell where it was made (and sometimes when) just by minor differences in the make-up. Moisture content, stuff like that.

A bit like buying a can of beans from the same manufacturer once a week. If you broke the beans/sauce down you could tell which week the can was produced in just by the minor variances although they would probably taste the same. Wonders of modern science.

And if I recall right, the 1968 Tet Offensive was the Viet Cong's biggest full scale attack. That's when they invaded the streets of Saigon and other provvincial cities. The US government got a major shock and (incorrectly) the western media saw it as a major victory for the VC. In actual fact, the VC were mauled so badly by US and South Vietnamese forces during the attack and following few days, they never actually recovered fully right up until the fall of the South. A lot of their operations were taken over by North Vietnamese regulars.

You'll all have seen the camera footage of the VC being shot in the head, right in full view of the media. He was dressed as an ordinary civilian and you see his body fall to the street and blood coming from the wound. That was the '68 Tet Offensive.

The guy who shot him was a senior South Vietnamese officer. He had been at the US Embassy when he was told that the VC had attacked his home. When he and his men arrived, they found that the VC had butchered his wife, his children and his Sister in Law. The VC who was shot was captured in the house.... I would have done the same.

I would do the same right now if I was in Bali and one of those (Blank, Blank, Blank) terrorists was standing in front of me.

War is nasty, violent and vicious. You expect to be killed in war. You don't expect to be killed when you're having a drink and a dance in a nightclub. And you're not at war.

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"Good people do not need laws to tell them to act responsibly, while bad people will find a way around the laws."
- Plato (427-347 B.C.)