President Donald Trump announced Sunday that his proposed Triumphal Arch project near Washington, D.C., will be converted into a "top grade Military Complex." Trump stated on his social media platform that the modification is being made at the request of the U.S. military.

The Triumphal Arch, a project previously planned since the Civil War era, will be situated at the Receptive Circle adjoining the Arlington Memorial Bridge. According to Trump, the structure will be equipped to house, store, and rapidly deploy large numbers of drones. It will also feature sniper positions on both the roof and plaza areas, with substantial sniper ammunition storage.

Trump touted the project's national security purpose, a rationale he also applied to a controversial White House ballroom renovation. He claimed the arch would provide unparalleled capabilities, stating, "There will be no facility like this anywhere in the World." He further emphasized that Washington, D.C. is the only major world capital lacking a triumphal arch, positioning his project as a significant addition.

The Pentagon declined to comment when reached by ABC News regarding the arch's new proposed function. This development comes as the 250-foot arch project faces legal opposition from military veterans and preservationists.

Last week, the administration acknowledged that the arch's location along the Potomac River, near Arlington National Cemetery, would negatively impact the landscape and river views. However, officials stated these effects could not be fully avoided due to the project's centrality.

A group of Vietnam War veterans has filed a lawsuit seeking to block the arch's construction. They petitioned a federal judge earlier this month for a temporary restraining order to halt excavation work, arguing the arch would obstruct views of Arlington National Cemetery and lacks congressional authorization.

Trump's administration has previously defended the arch as a necessary undertaking, despite acknowledging its environmental and visual impacts. The project's dual purpose as a landmark and a military asset marks a significant shift in its publicly stated objectives.

Further details on the military's specific requirements or the timeline for the proposed conversion remain undisclosed. The legal challenges and ongoing acknowledgment of adverse environmental effects suggest potential continued hurdles for the project.