A. A will executed by a person while in the military service of the United States, as that term is defined in the Servicemembers Civil Relief Act (50 U.S.C. § 3901 et seq.), that purports on its face to be witnessed as required by § 64.2-403, upon proof of the signature of the testator by any two disinterested witnesses, shall be presumed, in the absence of evidence to the contrary, to have been executed in accordance with the requirements of that section and shall be admitted to probate as if the formalities of execution were proved.