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.
The Tigers used the F3D-2 to train pilots and Radar Intercept Officers for duty in Korea. During the Korean War, more enemy aircraft were destroyed by F3D's than by all other Navy types. The squadron remained at MCAS El Toro, and in June 1958 accepted the F4D Skyray (affectionately known as the Ford).