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  1. The Cygnus spacecraft begins its separation from the International Space Station
  2. Sailors lined up in formation to represent USS Pennsylvania's 50th Patrol out to sea
  3. Surface of Mercury
  4. A CH-53 Sea Stallion lifts a HU-25 Guardian Coast Guard aircraft
  5. Conceptual image of human tooth
  6. Space shuttle Discovery backdropped by Earth's horizon
  7. Amphibious assault ship USS Bonhomme Richard
  8. Illustration of an Allosaurus fisherman
  9. Ticonderoga-class guided-missile cruiser USS Chancellorsville
  10. Vintage Circus Poster Of Five Ringling Brother's Bust Portraits, 1903
  11. Vintage Carl Hagenbeck's Tierpark Circus Poster Of A Giraffe, 1916
  12. Vintage Circus Poster Of Portraits Of Carl Hagenbeck And BE Wallace
  13. Vintage Travel Poster For Flying Northwest Airlines To New York, Of Statue Of Liberty
  14. Vintage portrait of President Ulysses S. Grant
  15. Firefighters extinguish a simulated cargo fire at RAF Mildenhall, England
  16. President John F. Kennedy
  17. A U.S. military truck with wrecker mount towing a jeep, 1942
  18. Sailors man the rails as the ship pulls into Naval Station Norfolk
  19. Member of the US Navy parachute demonstration team
  20. The Nimitz-Class Aircraft Carrier USS George Washington
  21. A Landing Craft Air Cushion Comes Ashore At US Marine Corps Base Camp Pendleton, CA
  22. The Snake Wagon, With A Snake Performer At A Circus, 1874
  23. A Fully Armed MQ-9 Reaper Taxis Down An Afghanistan Runway
  24. An F/A-18C Hornet launches off the flight deck of USS John C. Stennis
  25. A woman assembles part of the cowling of a B-25 bomber motor, circa 1942
  26. A US Navy HH-60H Seahawk Helicopter Dispenses Flares And Chaff
  27. Vintage 1936 Travel Poster Promoting Lancaster County, Pennsylvania, Of An Amish Family
  28. Pallets Of Cargo Inside Of A C-17 Globemaster III
  29. Conceptual image of the coronavirus
  30. Sircraft carrier USS Ronald Reagan and USNS Bridge during a replenishment at sea
  31. A Japanese light tank sits atop the medium tank Killer
  32. Airman floats through the sky carrying the American flag
  33. An F-15E Strike Eagle breaks away from a KC-135 Stratotanker after refueling
  34. A CH-53E Super Stallion Conducts Flight Operations
  35. US Air Force Master Sergeant Guides A CH-47 Chinook To A Drop Site
  36. A B-2 Spirit Flies Into Position During A Refueling Mission
  37. US Army Combat Infantrymen Provide Security During A Patrol
  38. Comparison Of A Normal Eye And An Eye With Hyperopia
  39. Different types of acne, non-inflammatory and inflammatory
  40. A Standard Missile Three is launched from the Mark 41 Vertical Launch System
  41. Vintage Travel Poster Of A Northwest Orient Airlines System Map, 1950
  42. A F-22 Raptor Flies In Formation With The Royal Air Force Aerobatic Team, The Red Arrows
  43. The Wall Of Fire Is Set Off Behind The U.S. Navy Blue Angel Demonstration Team
  44. US Navy Landing Craft Air Cushion Enters The Well Deck Of The USS Green Bay
  45. Ulysses S. Grant August 6, 1885
  46. The Guided-Missile Frigate USS Underwood
  47. Vandenberg successfully launched a Delta II rocket from Space Launch Complex-2
  48. Amphibious transport dock ship USS San Antonio transiting the Gulf of Aden