Several days earlier, a helicopter had rocketed the small Cambodian village of Prey Toul near the South Vietnamese border, killing one civilian and injuring 23 others. Prince Norodom Sihanouk's government had complained, and now the International Control Commission -composed of Canadian, Indian and Polish officialswas on the scene to investigate. The fragments they saw were clearly from U.S.-made rockets. The projectile laid out on a table for inspection was a grenade of the kind fired by American helicopters.
"May I observe for the record that I consider this unusually rusty," said the Canadian, examining the grenade, while the crump of...