The US Navy is both a navy and an air force (it operates the most powerful navy in the world and arguably the second most powerful air force). Both its ships and its aircraft cost vast amounts of money and the US Navy does not have all the money it would like. Defense Secretary Lloyd Austin has warned in a letter addressed to the leader of the armed services committees that if the Navy chooses to fund a second Virginia-class submarine, it will delay the development of the Navy’s F/A-XX sixth generation fighter jet. Just days ago, the Navy stated that the sixth generation F/A-XX fighter jet remains a priority.