In 1971 VR-30 joined the Jet Age with two North American CT-39 Saberliners for high-speed executive airlift. In May 1973 the squadron received the first of four C-9B Skytrain II's to further improve its logistics support capability.
Vertical ridges can also be caused by nail injury and certain diseases, including rheumatoid arthritis, according to Rich. If, instead of a series of ridges, there's a single vertical streak, cautions Krant, this could be a sign of a tumor growing at the root of the nail.
Nail change not thyr: Usually fingernail ridges are related to trauma of the nail matrix or bed. This may be of fungal origin. Ocassionaly this may be related to polish or an infection. Pulmonary conditions may have nail changes and skin diseases such as psoriasis or melanoma can cause nail changes. ...Read more.