Helmet of Salvation?

And take the helmet of salvation (Ephesians 6:17a)The fifth piece of God’s armor is represented by the Roman soldier’s helmet, without which he would never enter battle. Some of the helmets were made of thick leather covered with metal plates, and others were of heavy molded or beaten metal. They usually had cheek pieces to protect the face.The purpose of the helmet, of course, was to protect the head from injury, particularly from the dangerous broadsword commonly used in the warfare of that day. That was not the much smaller sword mentioned later in this verse, but was a large two–handed, double–edged sword (rhomphaia, see Rev. 1:16; 2:12; 6:8) that measured three to four feet in length. It was often carried by cavalrymen, who would swing at the heads of enemy soldiers to split their skulls or decapitate them. . . .