dsc46827.jpg

The sign accompanying the reentry vehicle. It reads

Mark 6 Nuclear Warhead

The massive missile set atop the Titan II

The Mark 6 reentry vehicle carried the 9 megaton W-53 thermo-nuclear warhead, which weighed 8380 lbs and had a range of 5500 miles while traveling at 15,000 mph.

Strictly speaking, I think it was the Titan II which had the 5,500-mile range :-)