I walked in the red light on the metal detector went off, the gal at the security desk waived me over. She asked if I had knives or guns!

https://www.nationalww2museum.org/visit ... -visit#FAQ
The following exceptions to the firearms policy apply:
Armed private security contracted by the Museum.
Law enforcement officers (federal, state, parish, and municipal) on official business. If applicable, uniforms must be worn. If the law enforcement officer is not on duty, or is in civilian attire, the weapon must remain concealed at all times. If observed, they will be asked to conceal the weapon.
Citizens in possession of a Concealed Carry Permit (CCP) recognized by the State of Louisiana (Museum security will check credentials). The following State permits are NOT recognized by Louisiana and therefore cannot bring their weapon on campus: California, Delaware, Hawaii, Illinois, Maryland, Massachusetts, New Jersey, New Mexico, New York, Oregon, and Rhode Island. Museum policy does not allow military veterans to carry concealed weapons on campus without an authorized CCP. The weapon must remain concealed at all times.