leads 100 and 102 extend from the battery 78 to the threaded bolts 94 and 96 in this respect the electrical lead 100 coming from one electrical side of the battery 78 passes through contacts of the switch 84 so that this lead is opened and closed depending on the position of an actuator 104 of the switch 84 the improved aviator 39 s night vision system of this invention comprises a prior art night vision system 10 of fig1 and 2 and the portable battery pack 68 of fig3 and 4 in use the plug 28 of the goggle assembly 16 is inserted into the receptacle cavity 26 of the helmet mounted receptacle 14 with the spring mounted balls 38 on the plug 28 snapping into the pits 34 and 36 on the inner surfaces of the side walls 30 and 32 of the helmet mounted receptacle 14 when this is done with the groove 42 of the plug 28 engaged with the releasable ridge 40 the electrical contacts 54 of the plug 28 are in contact with the electrical contacts 50 and 52 of the receptacle 14 and if the battery pack 18 is set in an on position energy flows from the battery pack 18 via the electrical leads 20 the contacts 50 52 and 54 and circuitry within the goggle assembly 16 to the vision amplifying tubes 66 in this.