Uh.
That's because a sayeret is an SF unit here in the IDF.
We have oh so many -
Shayetet 13 (Sea commando, much like the US SEAL's. Also, where I served. They work alot with Sayeret Matkal on joint operations)
Sayeret Matkal (Uh, best of the best commando? Can't realy explain, but they were the ones that participated in Operation Entebbe and many many other important missions like the killing of Black September terrorist leaders in Beirut, they also trained the German anti-terror team GSG 9 after the Munich incident. They have many stuff under their belt.
Duvdevan (These guys don't fight in wars, they are a counter-terrorism unit that does only that. They consist of two parts, the grey and the red [I think] one is for assassinations and only assassinations and the other is for arrests and the like, I think [Again, not sure they are kinda secret].)
Shaldag (The air force's special forces, these guys come in choppers to kick ***, much like the US Rangers.)
Anyway, there's much much more Sayerot, you can view alot of them in
http://www.isayeret.com , just go to Unit Profiles and view for your pleasure.
So they kind of merged all of the Sayarot in one unit in WinSPMBT.