There is no reason to add some engineering reference when it says architecture and engineering... these logos are blah and it could be done better. I would do more research. You will be surprised (or maybe you won't) how bad a lot of architect/engineer logos are. Look at architects who have spent some time with their branding Gensler, HOK, NBBJ.... it's simple stuff, why? I don't think they want their business to be defined by their logo, they want something that is easily recognizable, and a mark for their marketing materials that does not clutter a layout.