I hauled a load 55 gal drums of AO from Muscatine, IA to Seattle once for shipment to SE Asia, which may have been AO.
I was part of the inspection team that monitored the loading of AO into the incinerator ship at Gulfport, Ms., in August of 1974. The railcars were from DuPont in Houston and Pine Bluff, Arkansas. We wore chemical warfare suits in the Mississippi heat and checked for leaks in the rail cars.
AO was incinerated 12 miles out in international waters.