Modification of Restricted Areas R-4201A and R-4201B; Camp Grayling, MI

This action modifies the designated altitudes of restricted area R-4201B, Camp Grayling, MI, by raising the restricted area ceiling from 9,000 feet mean sea level (MSL) to 23,000 feet MSL to match the ceiling of the adjacent restricted area R-4201A, Camp Grayling, MI. Additionally, this action adds a "tie-in" boundary point in the R- 4201A boundaries description to ensure a shared R-4201A and R-4201B boundary. Lastly, this action makes minor administrative changes to the R-4201B time of designation information and the R-4201A and R-4201B using agency information to standardize the format of the information provided describing these restricted areas.