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 Super Stallion, produced by Sikorsky, is both the largest and heaviest helicopter used by the military. It has been used nearly three decades, and boasts a seven-bladed main rotor. The Marine Corps has been using them since the 1980s for heavy lifting as they can carry 73,500 pounds of cargo. The Super Stallion is expected to be in-use until 2025.