Fact: F-15s escort the B-2 bomber in (at least) UK airspace in order to mask any signature recording (radar or IR) by the British boffins in white coats. This followed claims by "us" after the bomber appeared at its first Farnborough (1994?) and was observed. What-was-DERA have a lovely IR camera (this is UNCLAS) as the footage of MiG-29s, etc., have appeared on Discovery on the Yanks were not happy that some foreigners can record such things, even at a public event...
Fact: whilst at Khamis Mushayt during Gulf War 1, dead/stunned bats were found on the hangar floors around the F-117s as their sonar was always deflected by the F-117's "hopeless diamond" design.
Cheers
Rudolph