While the United States government claims to be horrified every time there are reports of a chemical attack that was allegedly carried out by the Syrian government, history serves as a reminder that the U.S. is responsible for carrying out a number of chemical attacks on thousands of unsuspecting Americans, and some of the innocent victims are still suffering from the effects today.
In 1977, the U.S. Army admitted that it secretly conducted at least 239 germ warfare tests in the open air in cities across the country between 1949 and 1969. The areas where the lethal germs were simulated on the public were typically in major cities such as Washington D.C., San Francisco, New York City, Key West and Panama City, according to a report the Army submitted to the Senate Health Subcommittee.
In the report, the Army insisted that the purpose of the tests was to study how biological warfare affects the public, in case it needs to defend against it. Calling tests "essential," the Army claimed it needed to "substantiate theories and fill knowledge gaps and to determine vulnerability to attack."
Comment: And this is to say nothing of what the US has and is now doing around the world:
Pentagon Biological Weapons Program Never Ended: US Bio-labs Around The World