Can't let this one rest without a mention of the Westland Wessex's unmatched (until someone proves me wrong!) record of operational service.
First deployed to Northern Ireland in August 1969, finally left in March 2002 - nearly 33 years! And all that time, service there was recognised by issue of the General Service Medal with clasp "Northern Ireland". And the reverse of said medal, for those without access to one, reads "For Campaign Service".
Any advance on 32 years 7 months continuously on ops??