Probiotics such as bifidobacteria are typically used in cases when a disease occurs or might occur due to a kill-off of normal bacteria. For example, treatment with antibiotics can destroy disease-causing bacteria, but also normal bacteria in the GI (gastrointestinal) and urinary tracts.
The 3-place Hiller Model 360, military H-23 Raven, was based on the U.S. Navy UH-12, which was first flown in 1948. The H-23 Raven performed as a utility, observation, and MedEvac helicopter during the Korean war.
USS Bonhomme Richard heading to capsized South Korea ferry. An AH-64D Apache Longbow attack helicopter assigned to the 4th Aerial Reconnaissance Battalion (Attack), 2nd Aviation Regiment, lands on the flight deck of the amphibious assault ship USS Bonhomme Richard (LHD 6) April 11, 2014.