One thing that always seems to get lost is that there are insufficient PE examinations available for a large quantity of engineering fields.
My degree is in Aerospace Engineering, there is no Aerospace Engineering PE. California offers Structural, Civil, Chemical, Electrical, Mechanical, Agricultural, Control, Fire Protection, Geotech, Industrial, Metallurgical, Nuclear, Petrolum, and Traffic. Thousands of Aerospace Engineers work in the field and DESIGNED the vehicles that took Mr. Siegals inventions into space-but they should not be able to call themselves Engineers-except through an "industrial excemption"? Absurd.
I could have taken the Mechanical PE, we studied some of that material along with Thermodynamics, Materials, Structural Analysis, Engineering Econ, Physics, Math up the wazoo, Orbital mechanics, Vector Statics and Dynamics,Chem, etc.... But does passing the Mechanical PE qualify me to practice Mechanical Engineering? Machine Design? HVAC/R engineering? Equally absurd.
I later went back into Electrical, but that's another story. I think this dead horse, as over-flogged as it is, is a discipline specific issue representing the hubris of a portion of the engineering field at the expense of a huge portion of the Engineering world wherein the PE is irrelevant.