They came in white uniforms, blue capes and white caps, bearing a birthday gift that couldn’t be collected and a message that can. About 45 active and retired nurses from Pennsylvania and Maryland visited the Flight 93 National Memorial on May 20 to present a tribute to their nursing “sister,” Flight 93 passenger Jean Hoadley Peterson, on what would have been her 80th birthday. The nurses were members of Nurse Honor Guards from seven Pennsylvani…