Agent Orange was tested at Fort Ritchie Army base

However the report then explains the method used, stating it was used at both places.

Because terrain at Fort Ritchie and Fort Meade often was rough, officials used a 3-gallon tank sprayer with a 20-foot hose and a 9-foot stainless steel wand that had a 20-inch boom and three No. 2 Whirljet nozzles. The herbicides were sprayed downward from a large tank truck, at 30 pounds of pressure, to simulate aerial spraying, the report states.

The 2006 report also refers to 577 chemicals being screened at Fort Ritchie from April 1956 to September 1957.

“Environmental conditions, spray techniques and formulations that increased the effectiveness of the defoliants and desiccants” were evaluated, the report states.

The online Defense Technical Information Center, through which the 2006 report is available, notes that the citation for the report was created Jan. 19, 2011.

The 1956 report describes how Fort Ritchie was the site of tests with endothal and butynediol.

Endothal was sprayed on selected branches of various trees and shrubs in Fort Ritchie’s forested areas on Aug. 9 and 11, 1955, and periodically observed until Sept. 22, 1955.

In a separate test, endothal and butynediol were compared by spraying them on selected branches on Sept. 28, 1955, and observed until Oct. 14, 1955, the report states.