1. In a selective multi-mode fuze firing circuit for a missile: a. a select voltage input terminal means for accepting any one of three select voltages for selecting any one of proximity, impact-instantaneous and impact-delay modes of operation, b. a fuze voltage supply input, c. a proximity signal input, d. an instantaneous detonation means, e. a delay detonation means, f. an impact fuzing means, g. a two-position three-selection switch means, h. first and second fuse links, i. a gas diode which will ignite in either direction at a specific potential, j. a firing capacitor, k. the first section being closed to ground and the second and third sections being open in the first position of said threesection switch means, l. first and second charging resistors, m. one side of each of said fuse links, firing capacitor and one side of the third section of said three-section switch means being connected to the select voltage input terminal through said first charging resistor, n. said delay detonation means being connected between the other side of the third section of said three-section switch means and ground, o. first and second diode rectifiers, p. first and second bleeder resistors each connected to a respective opposite side of said firing capacitor, q. the other side of said first fuse link being connected to said proximity signal input, the cathode of said diode rectifier and one side of said gas diode; the other side of said gas diode being connected to ground, r. the other side of said second fuse link being connected to the anode of said diode rectifier and one side of the second section of said three-section switch means, s. said instant detonation means being connected between the other side of the second section of said three-section switch means and ground, t. said impact fusing means being connected between the other side of said firing capacitor and ground, u. one side of the first section of said three-section switch means being connected to the cathode of said second diode rectifier, v. the other side of the first section of said three-section switch means being connected to the other side of said firing capacitor for connecting said capacitor to ground when the switch means is in a first position and to the cathode of said second diode rectifier when in its second position, w. said second charging resistor being connected between the anode of said second rectifier and said fuze voltage supply input, x. whereby each of any of said three select voltages applied to said select voltage input terminal will select a particular one of any of proximity, impact-delay and impact-instantaNeous modes of operation.

4. A selective multi-mode fuze firing system comprising: a. a means for accepting any one of three voltages for selecting any one of three modes of operation, b. a fuze voltage supply input, c. a proximity signal input, d. moderate-energy instantaneous and delay detonation means, e. an impact fusing means, f. a firing capacitor for two phase operation, g. a gas diode which conducts in either direction at a specified potential, h. low-resistance first and second fuse links which operate to perform select functions, i. a two-position three-section switch means, j. a firing capacitor, k. the values of the three select voltages being for the first, from 0 to any potential below the specified ignition potential of said gas diode, the second, a positive potential greater than the specified potential of said gas diode, and third, a negative potential greater than the specified potential of said gas diode, said firing capacitor having a non-polar voltage rating such as to withstand the highest of said three select voltages, l. one side of each of said fuse links, firing capacitor and one side of the third section of said three-section switch means being connected to the select voltage input terminal, m. said delay detonation means being connected between the other side of other side of the third section of said three-section switch means and ground, n. first and second diode rectifiers, o. first and second bleeder resistors each connected to a respective opposite side of said firing capacitor, p. the other side of said first fuse link being connected to said proximity signal input, the cathode of said diode rectifier and one side of said gas diode; the other side of said gas diode being connected to ground, q. the other side of said second fuse link being connected to the anode of said diode rectifier and one side of the second section of said three-section switch means, r. said instant detonation means being connected between the other side of the second section of said three-section switch means and ground, s. said impact fusing means being connected between the other side of said firing capacitor and ground, t. one side of the first section of said three-section switch means being connected to the cathode of said second diode rectifier, u. the other side of the first section of said three-section switch means being connected to the other side of said firing capacitor for connecting said capacitor to ground when the switch means is in a first position and to the cathode of said second diode rectifier when in its second position, v. said second charging resistor being connected between the anode of said second rectifier and said fuze voltage supply input, w. whereby each of said three select voltages applied to said select voltage input terminal will select a particular mode of operation.