The Sikorsky is a reliable chopper as a rule. The 54 paratroopers (in 1977)died as the result of an errant grenade that went off. The 73 (in 1997) died as a result of pilot error in a fog. Blaming everything on an aging but otherwise reliable piece of equipment is ludicrous and unfair.
U.S. Democratic Senator Merkley airs support for Iran nuclear deal (Reuters)
from the article: Yasur helicopter: A history of splendid service - and deadly collisions