On 31 December 1972 Troop E was reactivated as a separate air cavalry reconnaissance troop .
On 31 December 1972 Troop E was assigned to the 172nd Infantry Brigade at Fort Wainwright , Alaska .
On 31 December 1972 Troop E was reactivated as a separate air cavalry reconnaissance troop and assigned to the 172nd Infantry Brigade at Fort Wainwright , Alaska .