What chemical defoliant does R.E.M.'s 'Orange Crush' refer to?

What chemical defoliant does R.E.M.'s “Orange Crush” refer to? It refers to Agent Orange.

R.E.M. released “Orange Crush” in 1988 as the first single from Green, their sixth studio album. The title alludes to Agent Orange, a herbicidal chemical mixture used extensively by the United States during the Vietnam War to remove forest foliage and expose enemy positions. The song’s subject is connected to the war experiences of Michael Stipe’s father, who served in Vietnam.

The title is sometimes mistaken for a reference to the soft drink Orange Crush, but the song’s lyrics, military imagery and anti-war context point to the defoliant. Agent Orange was manufactured for the U.S. Defense Department by companies including Monsanto and Dow Chemical. R.E.M. later included a live version of the song on R.E.M. Live, recorded in Dublin in 2005. “Orange Crush” also became one of the band’s most prominent political songs and helped introduce Green to a broad international audience.