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.
Malnutrition and Malabsorption Can Cause Ridges on Nail or Vertical Lines on Nails: Lack of proper intake of food leading to a deficiency in diet and nutrients like vitamins and minerals is known as malnutrition. While the lack of proper absorption of nutrients in to the body is known as malabsorption.