Ah, now I’m starting to get something:
“However, in May 1941, the first Americans in uniform came to Northern Ireland - three young navy flyers.”
One of these was active in Bismarck related flight.
And Eagle Squadron had nothing to do with it.
"Eagle Squadron, came to Northern Ireland in October 1941 "
4-5 months later.
Source:
http://www.irelandseye.com/aarticles/history/events/worldwar/secret.shtm
I also had false memory that Eagles become operational May 1941, but actually they become operational Feb 1941. Yes they were formed earlier but formation date sometimes means nothing.
Sorry for badly shaped question