Captain Shaw arrived in Boston on February 15, and at once assumed the duties of his position. Captain Hallowell was already there, daily engaged in the executive business of the new organization; and about the middle of February, his brother, Edward N. Hallowell, who had served as a lieutenant in the Twentieth Massachusetts Infantry, also reported for duty, and was made major of the Fifty-fourth before its departure for the field.

Line-officers were commissioned from persons nominated by commanders of regiments in the field, by tried friends of the movement, the field officers, and those Governor Andrew personally desired to appoint. This freedom of selection, — unhampered by claims arising from recruits furnished or preferences of the enlisted men, so powerful in officering white regiments, — secured for this organization a corps of officers who brought exceptional character, experience, and ardor to their allotted work. Of the twenty-nine who took the field, fourteen were veteran soldiers from three-years regiments, nine from nine-months regiments, and one from the militia; six had previously been commissioned. They included representatives of well-known families; several were Harvard men; and some, descendants of officers of the Revolution and the War of 1812. Their average age was about twenty-three years.