As you learned from Thomas Misa's textbook, it is fair to say that Leonardo da Vinci career-building commissions were as:

The correct answer to this open question is the following.

Although the question does not include options, we can say the following.

As you learned from Thomas Misa's textbook, it is fair to say that Leonardo da Vinci's career-building commissions were as a military engineering.

Yes, the great Italian artists from the Renaissance, Leonardo Da Vinci, was a visionary that developed engineering designs of what would be considered helicopters and parachutes. He had advanced mathematical knowledge for his time that was applied in the design of complex models of aviation. This including military vehicles for war such as tanks, catapults, and even submarines. So advances concepts for his time.

estoy bastante seguro de que la respuesta es una