Sentence:  The U.S. Army says a Kentucky National Guard soldier with aspirations of joining a U.S. Army special operations unit is <WSD>grandfathered</WSD> in under new regulations concerning soldiers with tattoos and asked a federal judge to dismiss his lawsuit. ... The regulations went into effect in March and ban tattoos below the knee or elbow. Soldiers who already have the ink are <WSD>grandfathered</WSD> in. Under the new regulations, any soldier with tattoos is barred from seeking a promotion to warrant officer or commissioning as an officer. 
Meaning of the word marked with <WSD> tags:  To retain existing laws or rules only for people or organizations previously affected by them, and to apply new laws or rules to the unaffected people or organizations. (from 1950s)