Oh, absolutely, Vincent Clement.  As the President has already stated, "American forces could not afford the “tremendous medical costs and disruption” of transgender service members." 

About "cost": the military's viagra costs are much higher than those associated with transgenders. 
About "disruption":  This goes to the very heart of the U.S. military.  Trump said, "Our military must be focused on  decisive and overwhelming victory..."  Absolutely right.  But how can the military have that focus, when tens of thousands of its men are focused on inabilities below the belt??

However, Vincent, banning those suffering from erectile disfunction from joining up won't solve the problem. I suspect many servicemen only develop the debilitating condition AFTER they are in uniform.