The training facilities add experience to the ships and fleet, whit gives a direct bonus to direct fire attacks
and defense against direct fire attacks. So the defence bonus is good even if you have the talisman.
Combat sensors with the talisman is a new one for me, I don't think it's needed in that case.
Someone else broke it down more fully over here:
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[ March 04, 2004, 01:38: Message edited by: Arkcon ]