AUGUSTA — The iconic image of a veterans cemetery, which can be seen everywhere from Normandy in France to Arlington, Virginia, has white headstones aligned with military precision in perfect rows in a carefully groomed setting, a place of honor to last the ages. That picture is changing. The Maine Veterans’ Cemetery System, which has four state-run burial grounds, plans to make more options available to veterans, their spouses and their dependents when their time comes. The newest possibility, likely to be in place within five years, is a “green burial” that avoids costly coffins and embalming in favor of preserving the natural landscape. Scott Brown, superintendent of the system, said he envisions plots within a meadow filled with wildflowers and along a winding path through the woods at the Maine Veterans Memorial Cemetery in Augusta. Once the new green burial area is complete, families could choose it, Brown said, or they could pick from among other options that include everything from cremation to double-vault plots where loved ones can remain together for all eternity. Those who prefer a traditional military gravesite can have one, Brown said.