Marine Corps helicopter retrieves astronaut Virgil I. Grissom from the Atlantic Ocean on July 21, 1961. Original from NASA.… https://www.rawpixel.com/image/441696/free-photo-image-war-helicopter-army-soldierFree Image from public domain licenseA beach ball-sized infrared camera, part of the Forward Looking Infrared Radar, has been mounted on the right siderail of… https://www.rawpixel.com/image/441532/free-photo-image-air-force-aircraftFree Image from public domain licenseOperation Airlift. Original from NASA. Digitally enhanced by rawpixel. https://www.rawpixel.com/image/441538/free-photo-image-helicopter-military-airFree Image from public domain licenseYO-3A (NASA-718) & MD-900 Air to air over Modesto/Crows Landing. Original from NASA. Digitally enhanced by rawpixel. https://www.rawpixel.com/image/441445/free-photo-image-helicopter-army-nasaFree Image from public domain licenseHigh above the skies at NASA's Kennedy Space Center in Florida a Coast Guard helicopter keeps watch on and around the… https://www.rawpixel.com/image/441110/free-photo-image-army-helicopter-airFree Image from public domain licenseA NASA helicopter takes off while participating in a Mode II-IV exercise at NASA's Kennedy Space Center in Florida. Original… https://www.rawpixel.com/image/440983/free-photo-image-helicopter-nasa-airFree Image from public domain licenseWranglers steadied the X-40A at NASA's Dryden Flight Research Center, Edwards, California, March 14, 2001. Original from… https://www.rawpixel.com/image/440003/free-photo-image-helicopter-aircraft-carrierFree Image from public domain license