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  1. An artist's illustration of what TRAPPIST-1's seven planets might look like
  2. Sailors attach pallets of supplies to an MH-60S Knighthawk
  3. Vintage Advertisement For Bitters Sold By S S Wyckoff & Co Of New York, New York
  4. A U.S. Air Force A-10 Thunderbolt II Pops Flares
  5. A US Air Force B-2 Spirit Approaches A KC-135 Stratotanker
  6. An Armored Vehicle At The Pabrade Training Area, Lithuania
  7. A Marine Attaches An M-240G Medium Machine Gun To The Turret Of His Humvee
  8. Anatomy of human nervous system and lymphatic system
  9. Group of H5N1 virus with glassy view
  10. A US Soldier Runs Down A 40-Foot Rappelling Wall
  11. Digital Composite Of The American Flag Over The Countryside
  12. Firefighter Extinguishes A Simulated Structural Fire
  13. F-105 Thunderchief planes pull up to a KC-135 Stratotanker refueling aircraft, 1966
  14. A B-52 Stratofortress bomber refuels during a close-air-support mission
  15. The guided missile cruiser USS Cowpens
  16. The Mine Resistant Ambush Protected All Terrain Vehicle and its predecessor, the humvee
  17. US Army Specialist Scans The Horizon
  18. Vintage Barnum & Bailey Circus Poster Of The Great Coney Island Water Carnival, 1898
  19. USNS Comfort Anchored Off The Coast Of Haiti In Support Of Operation Unified Response
  20. Vintage Travel Poster For The Sunset Route To New York Southern Pacific Lines, 1930
  21. A group of nurses receiving their first batch of mail from home in Australia
  22. A military police dog sits beside his issued protective gear
  23. A two-ship of B-1B Lancers release chaff and flares while maneuvering over New Mexico
  24. Civil War artwork of President Abraham Lincoln sitting in a chair
  25. Microscopic view of Penicillium expansum
  26. Men Looking At Material Posted In The Window Of National Anti-Suffrage Association HQ
  27. Aviation Electronics Technician Signals An F/A-18F Super Hornet For Launch
  28. View of a 90mm AAA gun emplacement, Okinawa, Japan
  29. A US Air Force RC-135V/W Rivet Joint reconnaissance aircraft
  30. US Army Specialist provides security in Afghanistan
  31. View From Space Of Hurricane Florence In The Atlantic Ocean
  32. An F-16C Falcon from the 18th Aggressor Squadron flies over an Alaskan mountain range
  33. US Air Force Airman communicates during Operation Spartan Shield
  34. Artist concept of the 10 hot Jupiter WASP exoplanets with a variety of cloud properties
  35. Full Earth showing city lights of Asia at night
  36. An Air Force HH-60G Pavehawk deploys pararescuemen
  37. Two women standing in a kitchen pantry, circa 1946
  38. Liberty Loan drive in front of City Hall, New Orleans
  39. Vintage Circus Poster For Adam Forepaugh & Sells Brothers Enormous Shows Combined
  40. Soldiers Jump From A C-130 Aircraft Over Germany
  41. The Donated Mural At Bagram Airfield, Afghanistan
  42. Marines Attach The Hoist Sling Of An AV-8B Harrier Jet Engine Container To MV-22 Osprey
  43. A Japanese-American boy gets a hug from his pal during lunchtime, April 1942
  44. An F/A-18C Hornet launches from the flight deck aboard USS Theodore Roosevelt
  45. Microscopic view of white blood cells inside blood vessel
  46. A US Air Force Honor Guardsman stands watch over the casket
  47. An F/A-18E Super Hornet Launches From USS Nimitz
  48. Lithographer Braces For Shock During A Simulated Attack And General Quarters Drill