Hours before federal police officers cleared a crowded park near the White House with smoke and tear gas on June 1, the lead military police officer in the Department of Defense for the D.C. region asked if the D.C. National Guard had a kind of military heat ray that might be deployed against demonstrators in the nation's capital, according to one of the most senior National Guard officers on the scene. In written responses to the House Committee on Natural Resources obtained by NPR, Major Adam DeMarco of the D.C. National Guard said he was copied on an email from...