The retired sergeant, Bob Dean, had a military career of 27 years, and during his service, he worked in military intelligence at Supreme Headquarters Allied Powers Europe (SHAPE), in 1963. His commendable record gives him great credibility when it claims to have witnessed classified information during military service. While exercising his professional activity in 1963, said he was instructed to draw up a detailed study of the activities of UFOs / ETs and how they might impact the relations between NATO and the Soviet Union. In an interview, Dean described four extraterrestrial races in a report entitled 'Assessment':

The alien groups known at the time were only four, and the Grays, beings of small stature, big black eyes and slender limbs, which are best known by the population today, were one of such groups.

There was a group that had truly human appearance. This group, in particular, was a cause of great concern for senior military, because they feared that these EBE's could to infiltrate the society, the Pentagon and even the White House.

Another group known at the time was formed by a very tall humanoid individuals, with a height between 2.1 meters and 2.7 meters, with very white and pale skin and did not have any fell in their bodies.

A fourth type of EBE had a reptilian appearance and vertical pupils, were bipedal and their skins and their faces seemed like a lizard. These were the four groups of EBEs known until 1964.

Another source, who had contact with the different extraterrestrial races, is Dr Michael Wolf. He says he worked secretly for the U.S. government for more than two decades. Despite some controversy over the Wolf's testimony, a significant number of UFO researchers, who interviewed him personally, found him coherent, consistent and credible. In an interview, it was alleged that:

According to Dr. Wolf, several confederations of extraterrestrial civilizations are visiting us in a systematic way. These are: The Alliance (formed by the ET system Altair Aquila, who observes human behavior), Corporate (of Grays from the Zeta Reticuli system), the Federation of Worlds (of unspecified races from many star systems), and United Races of Orion (cultures harboring several of these star systems). The Alliance is affiliated to the Federation of Worlds and Cooporate. The 'United Races of Orion' is affiliated to Coorporate and, through them, to Alliance and the Federation of Worlds.

Wolf reported that the vast majority of extraterrestrial civilizations is friendly, but said a small number of them are hostile and behave as interleveltary renegades.

Another individual who claims to have physically met with extraterrestrials, and spent some time in their ships is Alex Collier. Collier. He was interviewed by investigative journalist and UFO researcher Paola Harris who, despite initial reservations, concluded he was very coherent and much of what he says is consistent with her own investigations, carried out independently. In addition, some of the alleged conversations with extraterrestrials Collier led to astronomical discoveries, and subsequently confirmed on issues related to black holes. This gave credibility to Collier as "a true contacted."

In a series of articles, which were compiled in his book 'Defending Sacred Ground', Collier describes in detail the motivations of a series of alien visits. One example is the following:

"My understanding is the EBE's from 'system of Sirius A' are kind and try to help us. They feel partially responsible for the negative intrusion beings of 'System of Sirius B' that were colonized for them, in ancient times. The Sirius B are those who have signed secret agreements with governments giving them the Montauk technology (see Montauk Project). They have the same brain patterns of Orion Beings."

"The Tau Ceti System beings are also very involved. No one knows exactly about the intentions of Pleaidians, but I'll explain what I think. Some of those who live around Alcyon system can not be reliable because they have a hidden agenda. Those from Maya and Teygeta has a very clear goal: to keep the idea of freedom. Just because a group is identified as "Pleiadians" does not mean they are here to help us. People confuse that issue. The Alpha Cygnus are also here. There is a group of Arcturus and Procyon that are also trying to help us."

On February 20, 1954, a delegation of extraterrestrial races "observers" met with the Eisenhower administration, in a vain attempt to reach an agreement on the program of U.S. thermonuclear weapons. The main obstacle that prevented the achievement of any combination of the two parties, was these extraterrestrial races were not willing to provide technologies that could be used by the U.S. military. The systematic opposition of this group, to perform military agreements with humans, shows that there are several extraterrestrial races that were not involved with our usual warmongering.

This group of observers aliens had a "human appearance" and can easily integrate into our society, becoming indistinguishable from the rest of humanity. These races are described as coming from various star systems such as Lyra, Pleiades, Sirius, Procyon, Tau Ceti, Ummo, Andromeda and Arcturus, and lent some part of their genetic material for the formation of humanity on Earth. According to Alex Collier, a total of 22 extraterrestrial races have provided genetic material for the "human experience". These races include Reptilians, Grays, Anunnaki, and other various races.

"We as a product of extraterrestrial genetic manipulation, are possessors of a vast gene pool, consisting of many different racial memory banks, comprising at least 22 different different races. Because of our genetic heritage, and because we are connect with our spirit (higher self), the benevolent extraterrestrial races actually tend to see ourselves as 'exempted beings'."

As a result of this linkage, the extraterrestrials in this observer group, see humanity in the same way a protective parent sees a teenager, living in a dangerous environment. The vital interests of the races in this category are to ensure that global humanity evolves in a responsible way without endangering both yourself, as the galactic community.

There are two segments in this group of extraterrestrials. The first segment is composed of "aliens" who historically inhabit underground dwellings on earth; they are described as remnants of an ancient civilization that had evolved in a separate evolutionary path from humanity from the surface. The second segment is formed by aliens so similar to us, in your gene pool, that some of them could easily blend with the rest of humanity without being easily identified.