Private First Class Alonzo was a member of Company E, 2nd Battalion, 5th Infantry Regimental Combat Team. He was Killed in Action while fighting the enemy near Waegwan, South Korea, on 16 September 1950.

For his leadership and valor, Private First Class Alonzo was awarded the Silver Star Medal, the Purple Heart, the Combat Infantryman's Badge, the Korean Service Medal, the United Nations Service Medal, the National Defense Service Medal, the Korean Presidential Unit Citation and the Republic of Korea War Service Medal.