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.
After World War II, the U.S. kept the M4A3E8 Easy Eight in service with either the 76 mm gun or a 105 mm M4 howitzer. The Sherman remained a common U.S. tank in the Korean War. Despite no longer being the primary U.S. tank, it fought alongside the M26 Pershing and M46 Patton.