324 each of which is coupled to bus 304 components of rechargeable subassembly 321 may communicate on bus 304 with processing circuits 130 since rechargeable assembly 321 may be frequently removed and replaced for recharging bus 304 makes the interconnection between rechargeable subassembly 321 and processing circuits 130 mechanically and electrically reliable bus 304 includes communication signals and power signals suitable transmitter and receiver circuits may be used in launch device 300 and in rechargeable subassembly 321 when bus 304 coupling includes wireless coupling in one implementation power signals are coupled using magnetic circuits e g inductive coupling for the wireless transfer of energy into launch device 300 when rechargeable subassembly 321 is removed from launch device 300 and placed in a charging cradle not shown inductive coupling supports wireless transfer of energy from the cradle into battery 322 to recharge battery 322 communication signals may be coupled from bus 304 to either launch device 300 or the cradle by magnetic electrostatic radio and or optical circuitry for operation of launch device 300 and rechargeable subassembly 321 in harsh environments with risk of dust and liquid contamination magnetic coupling of power signals and radio communication of communication signals is preferred deployment unit i o 332 cooperates with one or more deployment units that each include a magazine having an indicator and or memory as discussed above and or include a plurality of cartridges each having an indicator and or memory as discussed above deployment unit i o 332 implements the.