Kennedy was the eighth and most recent US President to die Death in office , and the fourth ( following Lincoln , Garfield , and McKinley ) to be assassinated Killing .

Project Rulison , named Name_conferral after the rural community of Rulison , Colorado , was an underground 40-kiloton nuclear test project in the United States on September 10 , 1969 , about SE of the town of Grand Valley , Colorado ( now named Parachute , Colorado ) in Garfield County .

It is accessible Having_or_lacking_access via a gravel road , Garfield County Route 338 .