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.
(Photo by Kevin Krejcarek, US Army Japan). First JGSDF jump from U.S. aircraft in history during RF-A Japan Ground Self-Defense Forces from the 1st Airborne Brigade and 4th Brigade (Airborne), 25th Infantry Division paratroopers perform an airborne insertion and airfield seizure at Fort Greely, Alaska, Aug. 12. This event was part of Exercise Arctic Aurora 2015.