How many men in a north vietnamese regiment?

During the Vietnam War, the US Army (they have re-organized since then) consisted of Corps, Division, Brigades/Regiments, Battalions/Squadrons, Companies/Troops/Batteries, Platoons, Sections/Squads. In the Armored Cavalry, companies were called TROOP's (such as "F" Troop, from the TV comedy series back in the 1960's); And Cavalry battalions were called SQUADRON's. In artillery units, companies are called "Battery's", such as "C" Battery. And of course in the cavalry, companies are called "Troops's", such as "F" Troop. All other army units at company level are called companies. A Company (Battery, Troop) is the smallest command in the US Army, and is normally commanded by a CPT (Captain). Armor (tanks), Infantry (foot soldiers), and artillery (cannons, referred to as "GUNs") were, in Vietnam (this has changed since Vietnam) the ONLY COMBAT arms within the United States Army. All other units supported those "3 Combat Arms". EVERY "Company" in the US Army contained different numbers of men, by TO & E (required on paper), all were different. A truck transportation company might have a required strength of 300 men. Or a helicopter company might have 350 men. For the Combat Arms, the typical infantry company might have an authorized strength of 186 men. An armor company (tank company) might be assigned 80 men. In Vietnam, an artillery battery consisted of 6 Guns, with crews to man them.