Electronic Ordnance Apparatus Comprising Electronic Firing Sequencers for Use in Igniting the Propellant of Rocket Engines and Firing Units for Use in Initiating Bridgewires, which Are Used for Activating an Ignition Element of a Rocket Engine; [ Checkout and Test Console Apparatus for Said Electronic Ordnance Apparatus; ] Safe/Arm/Fire Mechanisms for Interrupting (Safing) and Aligning (Arming) and Detonating an Explosive Train; Igniters for Initiating the Burning of a Fuel Mixture or a Propellant; Gas Generators for Burning a Propellant to Produce a Sustained Flow of Pressurized Gas;[ Explosive Valves, Explosive Cable Cutters, Explosive Release Mechanisms Comprising Ball Lock Separation Apparatus for Use in the Separation of Rocket Stages; Destruct Apparatus for Destroying a Component of a Missile; Detonators for Initiating High Order Detonation in a High Explosive Component; Propellant Actuated Apparatus for Actuating a Mechanical Device by a Contained Propellant Charge; Exothermic Materials for Use as an Incendiary Composed of Quasi Alloys of Titanium or Zirconium; Electro-Optical Instruments Comprising Infrared Horizon Sensors for Spacecraft Altitude Control ]