Earlier this month, President Donald J. Trump signed a space policy directive to "restore American leadership in space." To the excitement of many, this directive includes sending men back to the Moon and perhaps even Mars. The prospect of making dreams a reality once again is enthralling, something we will do, echoing a previous chief executive, not because it is easy but because it is hard. To do all this, to optimize performance and ensure a successful, modern-day space program, government appropriators must adhere to a standard set of business protocols. It is essential NASA and the White House have...