NTSB says Army helicopter flying at 300 feet at time of collision, where 200 feet is the limit

And the Reagan Airport air traffic control tower was staffed with only one person instead of a minimum two persons while the accident happened!

Was it a human failure or accident for the Army helicopter pilot and crew to fly way over the limit? If I am not mistaken, we still do not know the flight hours of the pilot presumably a woman.

NTSB says Army helicopter flying at 300 feet at time of collision, where 200 feet is the limit | Just The News "The permitted flight ceiling for helicopters near Reagan Airport is 200 feet, which is meant to keep military and law enforcement helicopters clear of commercial aircraft."