The president's determination to stage a procession of America's troops and its military hardware, with 28 Abrams tanks thundering up Constitution Avenue in the nation's capital and 50 military helicopters thumping overhead,

Security officials said they plan to close numerous D.C. streets, some for up to four days, and deploy thousands of police officers and federal agents for the U.S. Army’s 250th birthday celebration as the city braces for throngs of onlookers expected to attend a huge military parade and festival along the National Mall,