During the Second World War, the Holy See granted to military chaplains the privilege of using for the celebration of Mass, instead of the Latin-rite portable altar stone, "a veil which had enclosed, and well fastened, authentic relics." This was later extended to peacetime military activities. Since it was not always possible to obtain a veil with authentic relics, the use of an Eastern-rite antimension was considered an acceptable alternative. - Use of Ann Antimension in the Latin Church