I was a fan of M.from U. loved it. NCIS, not so much, but watch it if nothing else is on. It's being run here in all kinds of order with new eps popping up for a few weeks then they all drop a few years and we get repeats, seemingly out of order so I really have no idea what's going on any more and don't care enough to sort it out.
I know I've seen McCallum in some movies and guest spots over the years and glad he found a niche on NCIS.
As Falcon said, nice when the 'oldies' can land another career in their later lives and blossom all over again, like James Garner, George Peppard and those mentioned etc.