Skybird, Space 1999 was the most expensive show for it's time and rocked it marked the peak for Gerry Anderson work, year one is the best shame year two was not as good. The reason was American money was the main backer of year two funny thing is a lot of Americans like year one more.
I bought series one on DVD, the digitally restored back into it's proper 35mm print. Much better than the 16mm print on video.
The Eagles are great and I got two Dinky Eagles in mint condition the transport & cargo eagles.
I even did a report on the eagle losses in the series (A true fan I am) and during the late 1980's into the 1990's I went to conventions and saw these great Eagles that were used in the series just blew me away.
As two your question Skybird, eagles were transport craft and some of them were fitted with lasers which would be no match for the Enterprise.
The Best Space 1999 site
http://www.space1999.net/users/moonbase99/
Eagle One A complete Restoration
http://www.smallartworks.ca/Articles/Restoration/Restore1.html
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Dr Who rest in peace 1963-2017.
To borrow Davros saying...I NAME YOU CHIBNALL THE DESTROYER OF DR WHO YOU KILLED IT!