Seems you got the whole lot now. I found this list of Thunderbirds serials, but not all would have been active in Europe 1967.

F-100D :1964 – 1968

55- 3506
55-3507
55-3520
55-3560
55-3561
55-3582
55-3606
55-3708
55-3737
55-3754
55-3776
55-3779
55-3791

Here is 55-3560 Illegally Parked somewhere (it is not numbered, so it might have been dismissed before 1967)

Further research show that 56-3844 did not fly with the Thunderbirds (although the article I originally got the information from, states that it was repainted as Thunderbird NINE – I took this to mean, that it had been painted as NINE before).

Its an ex-RDAF TF-100F.

It has also been revealed that 55-3520 flew as number SIX not number FIVE at Laughlin AFB.

So now we have:

SIX = 55-3520
ONE = 56-3093
TWO = 55-3737

55-3754 did fly with Thunderbirds from 1964 to 1968, but it could not have been SIX all the time.

55-3715 also flew with Thunderbirds in the 60’s.

56-3844 flew the airshows with the Thunderbirds. She is now painted as NINE, nut I’m not 100% she also flew as NINE – although its very likely.

In the 1967 season aircraft FIVE was 55-3520. This aircraft disintegrated during a show at Laughlin AFB in Texas on October 21. The Pilot Captain Merrill A. McPeak ejected safely.

For christ sake…….:D

Yes you are both right!