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  1. Microscopic view of blood clotting inside the artery
  2. Microscopic view of immunoglobulin G antibodies
  3. Tropical cyclone Hellen spins offshore Madagascar
  4. Microscopic view of plant tissues
  5. Sailors fire a 21-gun salute during a burial at sea ceremony
  6. Conceptual image of DNA
  7. Conceptual image of human lungs and rib cage
  8. Marines Rappel From A CH-53E Sea Stallion Helicopter
  9. A TIF-25K aerostat tethered on the stern of high-speed vessel Swift
  10. Conceptual image of influenza causing flu
  11. The Los Angeles-class attack submarine USS Topeka
  12. Paratroopers participate in a training jump with a CH-47 Chinook
  13. Close-up of the aircraft insignia on an old-fashioned warbird
  14. A B-2 Spirit Bomber Prepares To Refuel From A KC-135 Stratotanker
  15. Conceptual image of bones in human hand
  16. Sailors attach a cargo pennant to a MH-60S Sea Hawk helicopter
  17. Space shuttle Endeavour backdropped by a colorful Earth
  18. The Only Route Via Niagara Falls & Suspension Bridge, 1876
  19. USS Tucson
  20. An MV-22 Osprey tiltrotor aircraft approaches the flight deck
  21. Sailors salute the national ensign aboard USS Bataan
  22. An F/A-18E Super Hornet prepares to make an arrested landing
  23. Sailors perform a flight deck wash down aboard the USS George Washington
  24. Space Shuttle Endeavour
  25. Vintage Travel Poster Of Silhouettes Of Lewis And Clark With A Steam Train, 1920
  26. Manhattan & Brooklyn New York
  27. US Army soldiers stand on top of a large 274mm railroad gun
  28. Front view of an AH-64D Apache Longbow
  29. Vintage 1936 Travel Poster Promoting Lancaster County, Pennsylvania, Of An Amish Couple
  30. An AV-8B Harrier launches from the flight deck of USS Peleliu
  31. Human upper body showing bones, lungs and circulatory system
  32. Ships and submarines participating in the Rim of the Pacific exercise
  33. An AV-8B takes off from the flight deck of USS Tarawa lined with helicopters
  34. Carrier Strike Group formation of ships in the Bay of Bengal
  35. An X-47B Unmanned Combat Air System Conducts A Touch And Go Landing
  36. Hurricane Maria in the Caribbean and Hurricane Jose off the U.S. east coast
  37. A US Air Force aircrew prepares a B-52 Stratofortress aircraft for a mission
  38. An F/A-18E Super Hornet in flight over the Gulf of Oman
  39. Vintage Northwest Airlines Advertising Poster For Flights To Hong Kong, 1950
  40. Photovoltaic solar power plant
  41. A tomahawk missile launch aboard USS Sterett
  42. Microscopic view of bone fibre
  43. F-16 Fighting Falcons at Kunsan Air Base, South Korea
  44. The International Space Station in orbit above Earth
  45. Human eye with muscles and circulatory system
  46. An MH-60S Sea Hawk carries supplies during a replenishment at sea
  47. Japans main island Honshu
  48. Aviation Boatswain's Mate directs an E-2C Hawkeye on the flight deck