'Our teacher ... our fighting hero' February 17, 2007 By CATHERINE ANN VELASCO STAFF WRITER PLAINFIELD -- Wearing a red, white and blue lei a student gave him, Spanish teacher Bill Johnson gave tearful adioses and hugs to his students Friday before leaving for military training today to prepare him to serve in Iraq. Johnson, 26, who is a sergeant in the U.S. Army Reserves, was called to active duty barely three weeks ago. His biggest concern wasn't his future, but the 95 students in his Spanish I and III classes. "From Day 1, he has been worried about how...