I learned a lot of useless information when I got certified, after 20 years of running un certed. I learned a lot about crawler cranes (don't have one) and things like how many broken stands per foot are allowed for various types of wires rope (none, in my book anyway), and didn't learn a single new solitary thing about the actual work I do, mostly setting trusses on residential construction and HVAC work, in a practical sense anyway. But that's OK, I'm legal now. Hey RocketScott, you sure about that? Thought it was a Fed requirement, more power to you if not! I've been asked 3 times, actually 2 as one job fell thru, to show my cert since I got it. I was surprised however, by how hard the cert test was, not the practical, which I got a 99 on, better than the guy who owned the crane used for the test (damn right I'm bragging....) but the "bookwork." Out of 5 of us, all ops for years if not decades, 3 flunked out, or maybe two, can't recall, point being, it's not a cakewalk.