There has been discussions about this Trooper/Aces High thingamo before.
Once again:
-CoB did NOT cover The Trooper, it was Sentenced.
-CoB DID cover Aces High, it can be found on Spinefarm's(?) Metalrocks compilation and on some Maiden tribute album which is, as far as I know, yet to be released.
Feel free to correct me on the latter.