The Wharf, Vladivostok
Suetranskaya Street, Vladivostok
27th Infantry in Vladivostok
Railway Bridge Destroyed by Bolsheviks
Cossack Lancers
The Navy would escort the transports with combatants, but did not provide what today would be called sealift for War Department, i.e., Army, use. One has to remember these were separate Departments at Cabinet level until formation of the Department of Defense. Getting the War Department and Navy Department to cooperate was probably at least as difficult as getting State and Defense in full cooperation today. Each had its own mission and parochial interests with aspects of jealously and competition for resources. Out of this chaos on the Cuban beaches came the Army's own sea transportation service. I even speculate it had strong support from that Navy advocate "Teddy" Roosevelt himself since it is reported that one of his horses was among those lost.
The U.S.A.T. ships were crewed by civilian employees of the Army and some of the ships had additional Army staff on board to provide support services. The U.S.A.T. fleet was apparently small leading up to WWI but was grown to some 500 ships during the war.
For more info on the U.S.A.T. check out this link.
