I tnink the concept "Realistic to the switch" will loose with the "Patriot". The SA-2 to 5 are old, but you have literature and real officers, to make them really "real"

Correct.

Nobody in Hungary has any qualifications about the Patriot.
nope

Meanwhile I had the privilege of personally sitting in a ZSU-24-4V1 Shilka for hours, and has connections to the ex-Trainer of the Shilka school in Hungary...
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All in all, Shilka would be realistic-to-the-switch, while Patriot would only give you a kind-of-feeling of the system operator job...
(yet still the most realistic available free sim)
... but still openly looking for other systems, and ways to develop the SAMSIM.
cool

Hpasp
Free SAM Simulator, "Realistic to the Switch"
(U-2 over Sverdlovsk, B-52's over Hanoi, F-4 Phantoms over the Sinai, F-16's and the F-117A Stealth bomber over the Balkans.)
http://sites.google.com/site/samsimulator1972/home

Book from the author - Soviet Nuclear Weapons in Hungary 1961-1991
https://sites.google.com/view/nuclear-weapons-in-hungary/
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