With conviction in his tone and a no-doubt-about-it confidence, George Filer is adamant about his beliefs. "Take it to the bank," he says bluntly, "there is life on Mars."A Medford resident, Filer is a retired U.S. Air Force major who writes a weekly intelligence report on UFOs called "Filer’s Files." He has investigated UFO sightings for more than two decades."It started when I was in the Air Force when London control asked us to intercept a UFO," Filer said. "We had it on the radar, and they were also tracking a UFO over the center of England."We got it on radar … but when we got a couple miles out from it, this object launched into space. We were doing more than 400 miles an hour and it took off more than 100 times faster. Having seen this object, I was convinced there is something out there."The conviction, Filer said, was reinforced when he saw another UFO rising from a lake near his home on Jackson Road in Medford."I have seen UFOs," Filer said without a hint of doubt or sarcasm. "I saw one in Medford, and I have talked with dozens of people who have seen UFOs in Medford. I talked to a police officer who saw one over the Ford dealer (on Route 70)."Filer said he has the opportunity to discuss UFOs with astronauts, cosmonauts and airline pilots. "They have seen them, but won’t say it publicly," Filer said. "To put it bluntly, our (military) air cruisers see them now, but they don’t talk about UFOs either. I’ve also had airline pilots contact me, but they are not supposed to tell the public they are seeing UFOs."