Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The Battle of Bong Son was the second major battle for the US 1st Cavalry Division, an airmobile unit of divisional strength, during the Vietnam War. It also was called Operation Irving A month earlier in 1965, in the Battle of the Ia Drang, the 1st Cavalry used all the division infantry, but one brigade at a time. One of the realizations that affected Bong Son was that with adequate helicopter lift, the traditional need to keep a strong reserve was less required the least involved unit usually could break away and go where it was needed.At the operational level, it was began as a pursuit of the Vietnam People's Army (PAVN) 2nd, 18th, and 22nd Regiments (forming the NVA 3rd Division) by the Army of the Republic of Vietnam (ARVN) 22nd Division, commanded by Brigadier General Nguyen Thanh Sang and assisted by the Republic of Korea Capital Division. The NVA fought back strongly and Sang asked for reinforcements by two ARVN airborne battalions, which still were not enough.