Who is Richard Farley from Word of Honor and what is their importance?

Richard Farley is the second of Tyson's soldiers who served as a source for Picard. Farley suffered a spinal injury after the incident at Hue, which left him in a wheelchair. Harper describes him as "drug dependent" and suffering "emotional disturbances." He also has trouble testifying to facts without becoming confused. Corva declines to cross-examine Farley because Tyson says he would rather use the discrepancies to discredit Brandt.