Fossil fuel is a general term for buried combustible geologic deposits of organic materials, formed from decayed plants and animals that have been converted to crude oil, coal, natural gas, or heavy oils by exposure to heat and pressure in the earth's crust over hundreds of millions of years.
Currently there are 10 Active Army Divisions. They are the 1st Armored Division, 1st Cavalry Division, 1st Infantry Division, 2nd Infantry Division, 3rd Infantry Division, 4th Infantry Division, 10th Mountain Division, 25th Infantry Division, 82nd Airborne Division, and the 101st Airborne Division. Currently there are 10 Active Army Divisions. They are the 1st Armored Division, 1st Cavalry Division, 1st Infantry Division, 2nd Infantry Division, 3rd Infantry Division, 4th Infantry Division, 10th Mountain Division, 25th Infantry Division, 82nd Airborne Division, and the 101st Airborne Division. Minor edit?
As of the last published information, there will be 31 sustainment brigades; 10 active duty brigades as part of the Army's active divisions, 2 independent active duty brigades, 10 Army National Guard brigades and 9 US Army Reserve brigades.