I am new here but just had to register when I heard you asking about a "Taskforce"
I have what I am told is a taskforce 18 and it is made by Dejon - the guy I bought it off told me that and you can believe it when you look at the dejon 14 and my boat as there are many simularities in the shape.
It's a cracking boat and is, as the other guy said, like a wilson flyer. I would guess of the same era and style (one copied the other) I would also agree it is a great boat at speed and at anchor also.
I use mine out of the Bristol channel for fishing and she sits on a trot mooring at the local yacht club.
It is the most stable 18 footer I have ever owned and gets upto 38 knots with a Johnson 60 VRO on the back.
Would love to see a picture of your boat to see if their the same as I have only ever seen one before, well I think it was anyway, as I remember.