These are the "Yellow series" books. Each book covers one year of the conflict from America's active combat involvement in 1963 until the fall of Saigon in 1975.
Vietnam Veterans for Factual History (VVFH), formerly known as Vietnam Veterans to Correct the Myths, was founded in 2014 by a group of veterans and historians concerned that Guenter Lewy's statement from 35 years ago, "Mythology, half-truth and falsehood concerning events in Vietnam abound and, unless corrected, will enter the textbooks for the mis-education of our children" has proven to be all too accurate. It is a project of the Radix Foundation, a 501(c)(3) Texas educational corporation.
Members of VVFH include distinguished historians, Dr. Robert F. Turner, Dr. Lewis Sorley, Dr. Geoffrey D.T. Shaw, Dr. Mark Moyar, and Professor Roger Soiset. Other members include former prisoners of war, former and retired Marine, Navy, Army and Air Force officers including SOG, former CIA officers, former USAID employees, and others who served in the war, as well as veterans and civilians with an interest in the history of the war.
Many VVFH members have published books on the war.