The following excerpt is taken from Lean In by Facebook COO Sheryl Sandberg.

The most common metaphor for careers is a ladder, but this concept no longer applies to most workers. As of 2010, the average American had eleven jobs from the ages of eighteen to forty-six alone. This means that the days of joining an organization or corporation and staying there to climb that one ladder are long gone. Lori often quotes Pattie Sellers, who conceived a much better metaphor: “Careers are a _________, not a ladder.”

Fill in the blank.

The following sentences have been used by a division of the U.S. military as part of its recruiting efforts.

Out here, it’s not where the sea takes you, but who it makes you. This is where you test your limits, build your strength and fulfill your potential. Become a part of something bigger.

Name the division.