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.
Soviet and Russian helicopters French and British helicopters. M.A.S.H. medevac helicopters This Bell Model 47 has an external litter for transporting wounded. During World War II, helicopters were used for numerous light utility duties such as scouting and searching for submarines.