What can be concluded from Rachman's research on the relationship between fear and courage in paratroopers?

Question

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Rachman's research suggests that courage is not the absence of fear but rather the willingness to act despite feeling afraid. This is supported by findings that paratroopers develop courage through repeated exposure to fearful situations, where they perform despite their fear, which in turn decreases their fear over time.

What Can Be Concluded from Rachman's Research on the Relationship