244.—Where—

(a) a reservist, who is called out for training or on permanent service or in aid of the civil power, fails to appear at the time and place at which he is required upon such calling out to attend, and

(b) his absence continues for not less than fourteen days,

an entry of such absence shall be made by the prescribed officer in the prescribed manner in the prescribed service books, and such entry F384[shall be evidence, until the contrary is shown,] of the fact of such absence.