(a) A commissioners court may purchase burial grounds to be used exclusively for the burial of honorably discharged persons who:
(1) have served in the United States armed forces during a war in which the United States participated; and
(2) die without leaving sufficient means to pay funeral expenses.
(b) A commissioners court may not purchase burial grounds under this section if there is a national military cemetery or other military plot in the county in which honorably discharged veterans of the United States armed forces may be buried free of charge.