“If we’re not willing to use it here against our fellow citizens, then we should not be willing to use it in a wartime situation,” said Wynne. “(Because) if I hit somebody with a nonlethal weapon and they claim that it injured them in a way that was not intended, I think that I would be vilified in the world press.”

Were you surprised by this statement? Shocked?
Well, you shouldn’t be. The US government and its military has a history of testing ‘non-lethal’ weapons on the citizens it supposedly protects.
The Tuskegee Syphilis Experiment
The United States government did something that was wrong-deeply, profoundly, morally wrong. It was an outrage to our commitment to integrity and equality for all our citizens. . . -President Clinton’s apology for the Tuskegee Syphilis Experiment to the eight remaining survivors, May 16, 1997
Project MK-ULTRA is another example.
“The Deputy Director of the CIA revealed that over 30 universities and institutions were involved in an ‘extensive testing and experimentation’ program which included covert drug tests on unwitting citizens ‘at all social levels, high and low, native Americans and foreign.’ Several of these tests involved the administration of LSD to unwitting subjects in social situations.” —Senator Ted Kennedy
A History Of US Secret Human Experimentation gives a comprehensive listing, beginning in 1931 to 1995 when it was discovered that biological agents used during the Gulf War were tested on prisoners in the Texas Department of Correction and 1996 when the Department of Defense admitted Desert Storm soldiers were exposed to chemical agents.

Unlike our Secretary of the Air Force, Israel doesn’t give warning.

In Palestine, On August 18, Bright blue water was fired from the canon at the demonstrators, totally unprovoked, as soon as they were within range of the massive white tank. Many demonstrators were soaked by the blue liquid, dying their hair, clothes and skin, and most of them reported subsequent burning and irritation of the skin that lasted into the night. Tear gas was also used against the demonstrators as soon as the water canon was engaged, so it is unclear whether the burning was from gas being absorbed into the wet skin and clothing, or whether the water itself contained a chemical. Regardless, the message from the Israeli army was clear: non-violent protest will not be tolerated and will be met by increasing displays of force. sources here and here
This is what rubber bullets did to lawyer and activist Lymor Goldstein, shot by Israeli soldiers during a peaceful demonstration in Bil’in on August 11, 2006.

One more thing:
Microwave beams disable video recording equipment.