How many men in a infantry division?

Once again, ever since the reorganization of the military in the early years of WW2, there have been 28 troops in a platoon, 4 platoons in a company, 4 companies in a battalion, 4 battalions in a regiment and 4 regiments in a division. Thus, about 4x4x4x4x28=7168 troops PLUS a whole bunch of commissioned and non-commissioned officers, warrant officers and other administrative personnel including cooks, bottle washers and etc. The actual total varies from unit to unit, and units are seldom at full strength. The above describes the "Square Division" within the US Army prior to WW2 and also used in WW1. Just before WW1 began, the US Army down-sized their divisions so they could be more maneuverable on the field. The typical Infantry Division contained 15,000 men. There were 4 Companies (3 rifle and 1 heavy weapons) in each Battalion. 3 Battalions to each Regiment. 3 Regiments that made up the Infantry Division.

There were also 3 Artillery Battalions but soon, they added a 4th heavy artillery battalion. In addition, there were Engineering Battalion, Medical Battalion, Quatermaster, Ordnance Company, Signal Company, Recon Troop, Military Police, etc. Each Regiment had 1 Cannon Company and 1 Anti-Tank company and 1 Service Company. Link to simple Organizational charts of US Army Infantry Division: http://www.custermen.com/ItalyWW2/ArmyOrg/OrgChart/Charts.htm