Are ALL dispatchers trained...

It's a very long story but I would simply refer you to the CIA sponsored Robertson Panel Report from 1953. The panel met for a grand total of 12 hours over three days to review hundreds of reports, photos and films. All of the members were highly skeptical of UFO reality. The report recommended the policy subsequently adopted by the U.S., which was to debunk all UFO sightings.

The Air Force's Project Blue Book was merely a PR organization that became the instrument for carrying out this policy. Almost all of the serious work done by Blue Book occurred during the short tenure of Capt. Edward Ruppelt as head of the project from 1951-1953. After the Robertson Panel Report, the Blue Book staff was severely cut back and all proposals to carry out ongoing scientific field investigations such as monitoring stations to film, measure and triangulate sightings were trashed. Blue Book rarely investigated any reports in the field and even more rarely carried out even the most elementary scientific investigations. The staff typically consisted of only one or two officers, an NCO and one or two clerk/secretaries. The scientific brainpower available to the Air Force was almost never utilized.

Astronomer J. Allen Hynek, Blue Book's primary scientific consultant, complained that he was never even made aware of many of the best cases until he stumbled upon them in the files, often months or even years after the incidents had occurred. The project ended after the infamous Condon Report of 1969 concluded that UFOs were not worthy of further investigation despite the fact that 30% of the incidents cited in the report itself were classified "unknown"! Condon's conclusions, prominently placed at the beginning of the report, were in total contrast to the studies carried out and documented in the remaining body of the report.

Since the Condon Report and the closing of Blue Book, the U.S. has maintained it has no interest in, does not collect and does not investigate UFO reports. A number of FOIA requests however have revealed declassified documents long after 1969 that did refer to UFO incidents and investigations by U.S. agencies. Particular attention was given to the 1976 Tehran UFO incident during which a UFO disabled the missiles targeted at it by F-4 Phantom jet fighters from the Iranian Air Force. Officially however, denial of all UFOs is the U.S. government's position. When denial fails, mundane explanations such as weather balloons, stars, meteors, etc. are put forth as explanations.

The U.S. counts on the "laugh" factor to minimize the number of UFO reports and the level of public interest. Even in the heyday of UFO reports during the early 1950s, Capt. Ruppelt estimated that only one in ten UFO sightings were ever reported to official authorities. Nowadays, given the ridicule suffered by people making such reports, it is probably much fewer than one in ten.

It always amazes me that, although the topic of UFOs isn't often brought up in everyday social conversations, if it is brought up, people one would never suspect to take the topic seriously begin to offer up their UFO experience(s).