I believe Douglass' book offers one of the best detailed explanations answering the "why" JFK was marked for death question. I loved the book up until I came to page 297 where Douglass recounts the story of Air Force sergeant Robert Vinson.
Vinson's story says that he traveled from Ent Air Force base in Colorado Springs CO to Washington DC a few days before the assassination in order to inquire about the reasons for not receiving a promotion. He said he met with a colonel Chapman in a basement office of the Capitol Building on November 21st. Chapman was supposedly some type of liaison officer between the Pentagon and Congress. While in Chapman's office, Vinson claims he overheard Chapman on a telephone conversation recommending the Dallas portion of Kennedy's trip to Texas be cancelled because "there had been something reported".
Chapman after hearing Vinson's story, sent him to a Pentagon personnel officer, who said he'd look into Vinson's promotion matter. On Friday morning Vinson went to Andrews AFB to try to catch an Air Force hop flight back to Colorado. Vinson then was put aboard a C54 ( 4 engine military version of a Douglass DC-4) that had no Air Force markings or serial numbers, there was only a "rust brown graphic of an egg-shaped earth,crossed by white grid marks".
During the flight, somewhere over Nebraska, Vinson said the pilot announced over the intercom that the President had been shot and shortly thereafter the plane made a 90 degree turn to the South. At around 3:30 pm Vinson recognized the skyline of Dallas, where the plane landed "in a rough sandy area alongside the Trinity river. Shortly after landing 2 men boarded the plane, one of which Vinson came to recognize as Lee Harvey Oswald. Vinson said the plane took off and landed at Roswell AFB, New Mexico , where he later caught a hop back to Colorado Springs.
There are so many implausible elements to this story that it boggles my mind how Douglass could believe it.
I'll preface my response by stating that I too am an Air Force veteran that was stationed at Ent AFB, in Colorado Springs.
Item 1. It should not have been any mystery to Vinson about his promotion status. In the days before the rapid expansion of personnel for the Vietnam fiasco, promotions in the Air Force were notoriously slow. I entered the Air Force in August of 1968 and both of my drill instructors during my basic training, had been in the service for twelve years each and both were at the rank of Sergeant E-4. Vinson was already one rank higher at Staff Sergeant E-5, which was normal for someone who had 16 years service such as Vinson. Once Vietnam ramped up, promotions came much more quickly. I made Staff Sergeant E-5 in less than 4 years.
Item 2. Travelling to the Capitol Building in Washington D.C. to inquire about a promotion makes no sense at all. All records for promotions are or were kept at the Air Force's Military Personnel Center at Randolph AFB, San Antonio, Texas. Vinson would never have made it into any colonel's office. The colonel's gate keeper would have blown him off as a nut case. He would have never even made it in to the Pentagon building,
Item 3. I can't envision any circumstance that would have allowed Vinson to be placed aboard an unmarked CIA plane for a military hop, especially one that had its itinerary changed to perform one of the most covert missions of the 20th century.
Item 4. The C-54 aircraft was noted for having a weak nose gear assembly. Having that plane land on a sandy, under construction, dirt road along the Trinity river, would have been suicidal.
Item 5. Just check Google Earth. The Trinity river is within a few miles of downtown Dallas. (Oswald had to cross the Trinity to get to the Oak Cliff neighborhood) Thousands of people would have noticed such an unusual occurrence as a large 4 engine cargo plane landing along a riverbank in broad daylight instead of an airport. I can't recall hearing of anyone reporting such an occurrence on November 22nd 1963.
Some people will say anything to get their 15 minutes of fame. Vinson's hallucination has no credibility at all. Unfortunately it calls into question Douglass' ability to vet his witnesses, therefore reduces the stature of this otherwise excellent book.