By 1973 , how many women had served in Vietnam ?
The following companies and detachments were also under the 17th Aviation Group : I Corps ( Provisional ) , December 1965 – July 1966 ; expanded into the I Corps Aviation Battalion ( Provisional ) 57th Aviation Company ( Assault Helicopter ) , April 1972 – March 1973 ; departed Vietnam 58th Aviation Detachment , October 1968 – January 1972 ; departed Vietnam 60th Aviation Company ( Assault Helicopter ) , January 1972 – March 1973 ; departed Vietnam 129th Aviation Company ( Assault Helicopter ) , April 1972 – March 1973 ; departed Vietnam 180th Aviation Company ( Assault Support Helicopter ) , January 1972 – February 1972 ; transferred to the 7th Squadron , 17th Cavalry ; second tour : April 1972 – February 1973 ; departed Vietnam 220th Aviation Company ( Surveillance Light Aircraft ) , December 1965 – August 1966 ; transferred to I Corps Aviation Battalion ( Provisional ) 361 st Aviation Company ( Aerial Weapons ) , April 1972 – August 1972 ; departed Vietnam Troop H , 10th Cavalry ( Air ) , April 1972 – February 1973 ; departed Vietnam .