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?
Field army. A field army combines two or more corps, with 50,000 or more soldiers, and is typically commanded by a lieutenant general or higher-ranking officer. An army group plans and directs campaigns in a theater of operations, and includes two or more field armies under a designated commander.