If brownout's not the biggest problem with helicopters, what is?

Defence IQ recently produced an analysis of the six major problems with military helicopters and proposed a few suggestions for how to solve them. But what is the major problem? What is the one single factor that has the most detrimental impact to helicopter operations in theatre? Degraded Visual Environment (DVE), and more specifically brownout where helicopter rotor-wash stirs up dense clouds of airborne particles that impede visibility, is thought to be the cause of three out of every fou...
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