WASHINGTON (Reuters) - Senior Boeing (BA.N) executive Patrick Shanahan is U.S. President Donald Trump’s nominee to take over the No. 2 role at the Pentagon as deputy U.S. defense secretary, the White House announced on Thursday. The White House also announced plans to nominate: * David Norquist to become Under Secretary of Defense, Comptroller. Norquist is a partner with Kearney and Company, a Certified Public Accounting firm.  * David Joel Trachtenberg to become Principal Deputy Under Secretary of Defense, Policy. Trachtenberg is president and CEO of Shortwaver Consulting, LLC, a national security consultancy. * Kenneth Rapuano to become Assistant Secretary of Defense, Homeland Defense and Global Security. Rapuano is senior vice president and director of the studies and analysis group at the ANSER Corporation. 