Any fraternal or benevolent organization which maintains a plot in a place of burial mentioned in section 960, which is devoted exclusively to the burial of soldiers, sailors, or marines of the United States, may apply under this article to the board of supervisors of the county in which the plot is maintained. Upon a showing of need, the board may keep the plot free from weeds and rubbish, and keep in decent order and repair and free from defacement and injury any tomb, monument, gravestone, wall, or other appurtenance to the graves in the plot.