The answer depends on the Country and the Period and even the type of unit. For example a Paratrooper platoon is smaller than an Infantry Platoon. For WW2 US infantry Division, the Platoon consisted of 3 Squads of 9 to 12 men per squad.
During the Vietnam War, a US Army "Troop" was a US Cavalry "Company." Example(s): "A" Troop, "B" Troop, "C" Troop, etc. The Australian Army in Vietnam called their "Companies" a "Squadron", and called their "Platoons" a "Troop." (During the war) The US Army standard "Infantry" Platoon was approximately forty men. An "Armor" platoon (in Vietnam) consisted of 5 Patton tanks per platoon; with 20 tank crewmen per platoon...led by a 2nd or 1st Lieutenant.
Military units range in size from a Fire Team to an Army, from hundreds to thousands of men. Army Corps Division Regiment Brigade Battalion Company Platoon Squad Fire Team
In the British Army, there was one, or sometimes two medical orderlies to a platoon, depending in the kind of unit the platoon belonged to.
Depends. The U.S. Army has divisions of 10,000 to 30,000. Other countries have divisions of less than 5,000.
Typically, 38-40.
Depending on what type of platoon, it could be 25 - 40.
7,000 Troops!
At Least 10,000
US 82nd Airborne Division US 101st Airborne Division
Many US Army divisions have nicknames. The US Army's 101st Airborne division (which is the division trained for air assault operations) is nicknamed 'The Screaming Eagles'.
During the Viet War; US Army: approximately 40 men per platoon. A Patrol was normally 6 men; Squad 12 men. Two or more Squads made a Platoon. Two or more Platoons made a Company; two or more Company's made a Battalion; two or more Battalions made a Brigade (or regiment in the Cavalry). Two or more Brigades made a Division. Two or more Divisions made a Corps, two or more Corp's made an Army; two or more Armies makes up the US Army. During Viet War: Company=Troop (Cavalry)=Battery (Artillery) Battalion=Squadron (Cavalry) Brigade=Regiment (Cavalry)