President-elect Donald Trump’s nominee to be secretary of the Navy, John Phelan, has not served in the military or had a civilian leadership role in the service. While officials and defense experts said the Navy is in sore need of a disruptor, they cautioned that Phelan’s lack of experience could make it more difficult for him to realize Trump’s goals.

Trump late Tuesday nominated Phelan, a major donor to his campaign who founded the private investment firm Rugger Management LLC. The Trump transition team did not respond to a request for comment on his qualifications. According to his biography, Phelan’s primary exposure to the military comes from an advisory position he holds on the Spirit of America, a non-profit that supports the defense of Ukraine and the defense of Taiwan.

Not all service secretaries come into the office with prior military experience, but he’d be the first in the Navy since 2006. Current Secretary of the Army Christine Wormuth similarly does not have prior military service. She, however, has spent her career in a host of defense civilian positions.