The old Iraqi Army (Iran-Iraq war/Desert Storm era) would dig massive triangular shaped battle positions in the desert- basically a sand fort for their tanks. These would be arrayed in a gigantic saw-toothed formation that provided interlocking fields of fire between battalions and regiments. Each big triangle is a battalion, and each little triangle is a company (9 tanks).
I was trained to recognize them as an intelligence officer during Desert Shield/Storm. I noticed this on imagery was back in Iraq as an advisor to the Iraqi Army in 2008.
These positions were dug along the Iranian border. (direct link below)
Military - Historic - Battlefield
Links: www.google.com
By: MJ66
