Tony, if you want to make it a truly authentic Vietnam experience, dont forget the LSD, man!!
Seriously though, I'm not sure what you plan is within the realms of a helicopter that will be operated on a Permit to Fly. Surely there will be some money changing hands, unless you intend to offer it for free, in which case I'll take the right hand seat, wear a blood stained bandana and have 2 tabs of LSD before I go hurtling down Cirencester High Street with Wagner's Ride of the valkyries playing at full blast!.....Oh sorry, forgot that you wouldnt be able to hear it above the din of the Scout..