The winter bird is very pale, almost white apart from a dark shoulder patch. Each WVSP 4566TSW has the agency name and shoulder patch engraved. Both mandibles are yellowish and there is no red shoulder patch. The male has black upperparts, head and throat apart from a white shoulder patch. Its name derived from the shoulder patch of the US 2nd Infantry Division. The NAVCATs became the only Seabees to ever be authorized to wear a shoulder patch. Their current third jersey features the monster's head, taken from their shoulder patch design. There was no shoulder patch in 1918. The jersey incorporates the original Senators' 'O' logo as a shoulder patch. The upper-mandible is corn-yellow and there is no black chin stripe or red shoulder patch. Aside from a new shoulder patch, the team's uniform design did not change. In flight, drakes can be identified by the large white shoulder patch on each wing. The wings are streaked whitish, and there is a yellow shoulder patch. This broadens to form a light gray "shoulder patch" above the flippers. Juveniles have a light gray body without the rufous shoulder patch and yellow head.