UNITED STATES STEEL CORPORATION.

Mitchell treats U223 as the principal funnel but supplies no origin for the other two versions. U224’s panel appears incompletely coloured; Rosanoski reads it as a horizontal triband with triangles extending inward from hoist and fly without meeting.

The earlier Pittsburgh fleet used a red, white and blue swallowtail with a large white “P”. Accounts of the 1960s reorganisation describe adoption of a light blue flag with “USS” in a circle, initially called white but reported as silver by an owner of an actual flag. U274 represents a swallowtail seen on cap badges, while a contributor had seen the rectangular U273 form; Rosanoski notes that the account does not establish whether that rectangular flag was flown ashore or aboard ship. The original later labels a blue-and-silver flag outside the Pittsburgh headquarters on 28 April 2009 as U274. The recorded forms and identifiers are retained without resolving that distinction.