Germany's military has approved plans to buy 45 to 60 new heavy-lift helicopters, kicking off a competition between the two largest U.S. weapons makers for the contract worth nearly 4 billion ...
Depends on what you build. It is possible to build a helicopter that qualifies as an ultralight, and thus no license needed. If it exceeds the weight and power restrictions for an ultralight, then it is an experimental aircraft, that requires at least a solo ticket.