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.
What Causes Horizontal & vertical Ridges in Finger and Toenails Ridges in fingernails Vertical ridges sometimes appear along the length of the fingernails. Sometimes marks, discoloration or pits or grooves on a fingernail, such as those that run from side to side (known as Beau's lines), can be an indication of a nail injury or a health problem. However, in the case of vertical ridges, there is normally no reason to be concerned. These ridges look and feel like raised lines, and they run from the cuticle at the base of the fingernail to the tip. These ridges are not usually a sign of injury or a health problem but are a harmless result of ageing.