Again , a month later , on 9 March 1964 , silo 579 - 2 fell victim to another explosion that occurred during a propellant loading exercise .
On 13 February 1964 an explosion occurred during another propellant loading exercise , destroying launch complex 579 - 5 .
A month later , on 9 March 1964 , silo 579 - 2 fell victim to another explosion that occurred during a propellant loading exercise .
On 13 February 1964 an explosion occurred during another propellant loading exercise , destroying launch complex 579 - 5 .