A series of trial burn tests at the Anniston Army Depot's chemical weapons incinerator got underway Sunday.
The tests will determine if M55 rockets containing GB nerve agents have formed crystals inside.
According to spokesman Mike Abrams, the rockets are unique because the munitions were initially thought to have remained in liquid or gelled form when they were produced in the 1960's. But when processing of the chemical weapons began last year, it was discovered some of the GB nerve agent had transformed into crystals.
Abrams said the week long test known as "shakedown phase" will concentrate on the best method to handle the problem.
Almost 250 rockets had been processed as of last night. Since last August, the Army has destroyed more than 23,503 gallons of nerve agent.