How big are this guys balls, and what are they made of?

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to remove Soviet, Chinese, and Vietnamese-constructed land mines.

The still-incomplete database (it has several “dark” periods) reveals that from October 4, 1965, to August 15, 1973, the United States dropped far more ordnance on Cambodia than was previously believed: 2,756,941
tons’ worth, dropped in 230,516 sorties on 113,716 sites. Just over 10 percent of this bombing was indiscriminate, with 3,580 of the sites listed as
having “unknown” targets and another 8,238 sites having no target listed
at all. The database also shows that the bombing began four years earlier
than is widely believed—not under Nixon, but under Lyndon Johnson.

the Southeast Asian nation of Cambodia was taken over by a group of soulless assburgers known as the Khmer Rouge. ... and in under a decade they successfully managed to kill something on the order of two million of their own citizens for basically no reason at all.

The impact of this [USA] bombing, the subject of much debate for the past three decades, is now clearer than ever. Civilian casualties in Cambodia drove an enraged populace into the arms of an insurgency that
had enjoyed relatively little support until the bombing began, setting
in motion the expansion of the Vietnam War deeper into Cambodia, a
coup d’état in 1970, the rapid rise of the Khmer Rouge, and ultimately
the Cambodian genocide.

http://www.yale.edu/cgp/Walrus_CambodiaBombing_OCT06.pdf