Not sure how best to control your USB missile launcher? http://www.reghardware.co.uk/2006⁄07/06/usb_missile_launcher/
How about a proper Big Red Button?
http://www.reghardware.co.uk/2006⁄07/28/nuclear_war_usb_hut_heads_west/
http://www.reghardware.co.uk/2006⁄07/18/usb_nuclear_war_button_box/
That'll set you back around US$70 in total, but well worth every penny!