The only thimg that bothers me is if they are experimentl planes, then they dont fit the MO of previous efforts from the US;

Tactic Blue
Senior Trend
A-12
Have Blue
Aurora

All the above have been top secret and eventually filtered into the service and then become public knowledge, and all during the last 50 years, yet all of them are still fundementally planes, with the standard layout of wings and jet propulsion, you'd think after 50 years they'd of cracked this flying saucer bollocks and they'd be using them