The initial polyethylene balloons had diameters of only seven feet and carried payloads of five pounds or less.[72] As balloon technology advanced, payload capacities and sizes of balloons increased. Modern polyethylene balloons, some as long as several football fields when on the ground, expand at altitude to volumes large enough to contain many jet airliners. Polyethylene balloons flown by the U.S. Air Force have reached altitudes of 170,000 feet and lifted payloads of 15,000 pounds.[73]
During the late 1940’s and 1950’s, a characteristic associated with the large, newly invented, polyethylene balloons, was that they were often misidentified as flying saucers.[74] During this period, polyethylene balloons launched from Holloman AFB, generated flying saucer reports on nearly every flight.[75] There were so many reports that police, broadcast radio, and newspaper accounts of these sightings were used by Holloman technicians to supplement early balloon tracking techniques.[76] Balloons launched at Holloman AFB generated an especially high number of reports due to the excellent visibility in the New Mexico region. Also, the balloons, flown at altitudes of approximately 100,000 feet, were illuminated before the earth during the periods just after sunset and just before sunrise. In this instance, receiving sunlight before the earth, the plastic balloons appeared as large bright objects against a dark sky. Also, with the refractive and translucent qualities of polyethylene, the balloons appeared to change color, size, and shape.
The large balloons generated UFO reports based on their radar tracks.[77] This was due to large metallic payloads that weighed up to several tons and echoed radar returns not usually associated with balloons. In later years, balloons were equipped with altitude and position reporting transponders and strobe lights that greatly diminished the numbers of both visual and radar UFO sightings.
One classic misidentification of a Holloman balloon that was mistaken for a UFO, was launched on October 27, 1953.[78] According to the following account published in a widely distributed 1958 history of Air Force balloon operations, Contributions of Balloon Operations to Research and Development at the Air Force Missile Development Center Holloman Air Force Base, N. Mex. 1947–1958, a suspected Holloman balloon was tracked both visually and by radar over London, England on November 3, 1953.
“English accounts of the incident contained such statements as ‘tremendous speed,’ ‘practically motionless,’ ‘circular or spherical and white in color,’ ‘emitting or reflecting a fierce light.’ Altitude was reported as 61,000 feet—and as no research balloon had recently been sent up from Britain, there was ample room for local saucer enthusiasts to claim the ‘unidentified flying object’ as proof of their theories. A much likelier explanation, however, is that this was really the balloon launched from Holloman on 27 October.”[79]
High Altitude Balloon Payloads
Over the years, payloads transported by high altitude polyethylene balloons ranged from simple radio transmitters to anthropomorphic dummies to sophisticated satellite components and NASA interplanetary space probes. Many of these payloads, some of which weighed many tons, were not what someone would typically envision as being associated with a balloon. Examples of payloads flown in New Mexico by Air Force high altitude balloons can be found on [pages 52 and 53] at the end of this section.
Research projects of the late 1940’s and 1950’s conducted at Holloman AFB which began with the Project Mogul flights in June 1947, covered a wide spectrum of scientific research. One important experiment in space biology measured the effects of exposure to cosmic ray particles on living tissues.[80] Other projects gathered meteorological data and collected air samples to determine the composition of the atmosphere.[81] The first high altitude photographic reconnaissance project, a forerunner to today’s reconnaissance satellites, Project 119L, also used high altitude balloons launched at Holloman AFB.[82]
As early as May 1948, polyethylene balloons coated or laminated with aluminum were flown from Holloman AFB and the surrounding area.[83] Beginning in August 1955, large numbers of these balloons were flown as targets in the development of radar guided air to air missiles.[84] Various accounts of the “Roswell Incident” often described thin, metal-like materials that when wadded into a ball, returned to their original shape. These accounts are consistent with the properties of polyethylene balloons laminated with aluminum. These balloons were typically launched from points west of the White Sands Proving Ground, floated over the range as targets, and descended in the areas northeast of White Sands Proving Ground where the “strange” materials were allegedly found.
In 1958 the first manned stratospheric balloon flights were made from Holloman AFB (see [page 102]). In 1960, balloon tests of components of the first U. S. reconnaissance satellite were also flown at Holloman AFB. In the 1960’s, 70’s, and 80’s high altitude balloons were used in support of Air Force, and other U.S. Government and university sponsored research projects. Instrument testing of atmospheric entry vehicles for the National Aeronautics and Space Administration (NASA) space probes is one prominent example.