What was a common theme that led to major issues in both the disaster at mann gulch and challenger space shuttle launch?

The common theme among the two disasters was lack of decision making training for the professionals.

Explanation:

The Challenger Space Shuttle launch disaster was as a result of poor decision making which resulted in a low quality substandard part in the main flight. While the Mann Gulch fire was a poor judgement error of the firefighters. Thus they both have lack of decision making and training in common.