Sun Tzu advised in The Art of War, "When the enemy occupies high ground, do not confront him."
This is why, since the advent of flight, all battlefield commanders have sought to control the airspace above the battlefield – the "ground" above the high ground.
Control of the airspace grants its occupant a clearer view of an enemy's movements, better communications with friendly forces and the freedom to move quickly and unpredictably to attack downhill well behind the enemy's front lines.
Forces on land, at sea and in the air all reap the advantages of the establishment of air superiority – the keystone to victories from World War II to Operation Iraqi Freedom. Just as important, occupying that high ground denies those same advantages to the enemy.
Research into lasers may offer advancement in propulsion technology to get us into deep space and beyond for a fraction of the cost. The geniuses at the Air Force Research Laboratory are developing multiple ways to utilize laser power to enhance weapons, mining in space and electrolyze water.
In peacetime, maintaining air superiority provides a deterrent to those potential adversaries who heed the warning of Sun Tzu.
That is why the Air Force and its researchers are constantly looking far beyond the horizon of the current battlefield to develop new technologies enabling access to the highest ground possible – space.
Even before the Soviet Union successfully launched the first satellite, Sputnik, into orbit in October 1957, the United States was developing its own top-secret satellites to provide intelligence, surveillance and reconnaissance (ISR) of potential adversaries – Project Corona.
While Sputnik was little more than a beeping aluminum ball orbiting the Earth, it was an undeniable Soviet flag planted on the global high ground. The U.S. government knew that ceding that high ground greatly increased the chances of defeat should the Cold War with the Soviet Union turn hot.
Vice-President Lyndon Johnson, who oversaw the fledgling National Aeronautics and Space Administration (NASA), firmly acknowledged the national security benefits of advancing the peaceful exploration of space in 1963.
"I, for one, don't want to go to bed by the light of a Communist moon," said Johnson.
Today, the Air Force operates the largest GPS constellation in history with more than 30 satellites. Originally developed and implemented as a military navigation system, today we share it with the rest of the world while still relying on it for a variety of tasks from guiding precision weapons to delivering humanitarian supplies on the other side of the planet. (U.S. Air Force Graphic by Maureen Stewart)
To this day the U.S. Air Force has remained at the forefront of pushing farther into space, from launching communications and Global Positioning System (GPS) satellites to providing astronaut Airmen who first ventured into Earth orbit during Project Mercury, walked on the Moon during Project Apollo to Col. Jack D. Fischer currently aboard the International Space Station.
It is a legacy that surrounds and drives Dr. Wellesley Pereira, a senior research physical scientist with the Air Force Research Lab's (AFRL) Space Vehicles Directorate at Kirtland Air Force Base, New Mexico.
The very site at which Pereira conducts his research is named for an Airman who led the charge to put an American on the Moon.
Col. Buzz Aldrin was one of the first two humans to land on the Moon, and the second person to walk on it. (U.S. Air Force Graphic by Maureen Stewart)
The Phillips Research Site is named for Air Force Gen. Samuel Phillips, who served as Director of NASA's Apollo manned lunar landing program from 1964 to 1969. That program culminated in the first humans, Neil Armstrong and then Air Force Lt. Col. Edwin "Buzz" Aldrin, landing on the moon in 1969 as Air Force Lt. Col. Michael Collins piloted the Apollo 11 Command Module overhead. It was the kind of aggressive manned exploration of space that Pereira would not only like to see continue, but accelerate.
"The Air Force and its Airmen are seen as trendsetters, as in the case with GPS, benefiting all humanity, or with technologically-inspired precision airdrops from 30,000 feet of lifesaving supplies during humanitarian crises," said Pereira. "In doing this the Air Force establishes itself as a global power in which it does not cede higher ground to anyone… It pays dividends to be at the leading edge of that technology as opposed to playing catch up all the time. The Air Force can really send a very positive message by being that trendsetter in space."
The Joint Precision Airdrop System (JPADS) is an American military airdrop system which uses the GPS, steerable parachutes, and an onboard computer to steer loads to a designated point of impact (PI) on a drop zone (DZ). (U.S. Air Force Graphic by Maureen Stewart)
Pereira is currently researching infrared physics and hyper-spectral imaging as a means to provide ISR data over a wide range of light not visible to the human eye.
"We simulate cloud scenes viewed from spacecraft," said Pereira. " (Examining) all the aspects that affect an image from space like the artifacts caused by movement in the space platform; trying to process signals, trying to process information. We try to simulate these things in our lab just to understand spacecraft processes and how we can deal with this in post-processing."
Pereira's current position at AFRL as a research scientist coupled with a background in astronomy, physics and space research gives him the opportunity to think deeply about space and human space flight.
"As a research scientist, I've been involved in building payloads for the Air Force on satellites," said Pereira. "This has led me to think about satellites in general; launch, orbits, moving in and out of orbits, the mechanics of orbits and the optimization of orbits."
Those contemplations have led Pereira to envision an Air Force of the future that will propel its assets and Airmen to increasingly higher ground in space in a cost-effective way that combines technology old and new – sails and lasers.
"Up until now, we've been using chemical propulsion to get into space. Chemical propulsion is limited in what it can do for us in the future. We cannot go very far. We have to take resources from the Earth into space, which is a big issue considering we only can carry so much mass, we only have so much power, and so on. It is limited by chemical bond, but it is also limited by size, weight, power," said Pereira.
Description Here (U.S. Air Force Graphic by Maureen Stewart)
The concept of solar sails has existed for quite a while. A solar sail uses photons, or energy from the sun to propel a spacecraft. Photons have energy and momentum. That energy transfers to a sail upon impact, pushing the sail and spacecraft to which it is attached, farther into space, according to Pereira.
"The Japanese have already proven that we can fly stuff with a solar sail. In 2010, they sent up an experiment called IKAROS, Interplanetary Kite-raft Accelerated by Radiation Of the Sun. This was a very successful project," said Pereira.
"In the same vein as solar sails, futurists have also thought about laser sails. I think this is an area where the Air Force can develop an ability for us to propel spacecraft farther using lasers, either in the form of laser arrays on Earth or taking a laser array and putting it on the moon, to propel spacecraft without the cost of lifting spacecraft and chemical propellant from the Earth's surface."
In the near future, Pereira sees this method as a cost-effective way the Air Force can lift satellites into higher Earth orbit.
"You have spacecraft go into orbits that are just about 300 to 600 kilometers above the Earth. We call those Low Earth Orbits or LEO. Likewise, you have orbits that could be about 36,000 to 40,000 kilometers above the Earth. We call them Geostationary Earth Orbits or GEO orbits. Many communications satellites, as well as, a few other satellites are in Geostationary orbit…the way of the future, would be to use laser based arrays, instead of chemical propulsion, to fire at a satellite's sail to push it to a higher orbit," said Pereira.
"Our goal is to try and minimize taking resources from earth to space. We can literally just launch a rocket using a catapult that could boost to about 100 meters per second and, once we get it to a certain altitude, we can have an array of lasers focus on the sail on the rocket, propel it out farther, whether it's intended for a LEO orbit or whether it's intended for a GEO orbit. As long as you can build material that can endure the laser energy without tearing, I think this is a far cheaper way to go and it could save the Air Force a lot of money."
According to Pereira, developing this technology would naturally lead to the ability to propel spacecraft carrying Airmen farther into the solar system where they could establish self-sustaining outposts on ever higher ground.
NASA's Orion Multi-Purpose Crew Vehicle, the MPCV, is essentially a spacecraft designed to take astronauts farther than any human has ever gone before. (U.S. Air Force Graphic by Maureen Stewart)
"NASA's Orion Multi-Purpose Crew Vehicle, the MPCV, is essentially a spacecraft designed to take astronauts farther than any human has ever gone before. One test flight concept is to visit an asteroid called 1999 AO10, in around 2025," said Pereira. "This asteroid does not have a lot of gravity and not a lot of surface area, so rather than walking on the asteroid, the idea is for the spacecraft to connect itself to the asteroid, and for the astronauts to do spacewalks to mine materials, so that they can bring them back to Earth for analysis."
Past and current Air Force research during manned space flight has led to increased understanding of human physiological response to microgravity and exposure to radiation, development of life support systems, nutritious food packaging, sophisticated positioning, navigation and timing software and systems that could one day enable Airmen to routinely fly to and mine asteroids and planetary moons for needed resources.
Pereira also sees Air Force cooperation with commercial companies developing space flight technologies as a benefit to both, from developing suborbital space planes, manned capsules and space waypoints, or "hotels", to projects as ambitious as Breakthrough Starshot, a proposed mission to send a microchip all the way to Proxima B, an exo-planet orbiting the star Proxima Centauri, and transmit data back to Earth.
"They want to do this at about 20 percent of the speed of light, meaning it will take five times as long as it would take light to travel between the Earth and Proxima Centauri, approximately four light years away. So it could take only about 20 years for this chip to get to Proxima Centauri. Then if it beams images back at the speed of light, it would take another four years for that data to come back. In about 24 years, we would get data from Proxima Centauri, our nearest star," said Pereira.
To this day the U.S. Air Force has remained at the forefront of pushing farther into space, from launching communications and Global Positioning System (GPS) satellites to providing astronaut Airmen who first ventured into Earth orbit, walked on the Moon and are currently aboard the International Space Station. The future holds promises of laser-based sails and self-sustained space outposts. (U.S. Air Force Graphic by Maureen Stewart)
Pereira believes that the Air Force participating in such ventures into the space domain could lead to technologies that could send Airmen to the moons of outer planets in our solar system within a person's lifetime, benefiting the human race and keeping the Air Force firmly atop the high ground.
"First and foremost, Airmen, as many times in the past, can serve in the capacity of professional astronauts: providing services in scouting and setting up breakthrough scientific missions, establishing colonies for repair and mining in order to reduce or avoid having to take materials from Earth to space…enabling safe pathways, providing in-flight maintenance, refueling crews, more effectively than machines might be able to do."
"There are so many wonderful things about space that are so fascinating that we can explore and learn so much more if we just keep that aspect of space exploration going. We can achieve this by having our Airmen lead the way to an era of exploration enabled by human space flight."