Crossword puzzle clue "uss herein"

USS, herein?

Service found in the four longest Across answers herein

1 to 57 herein

1980 William Hurt film (and what eight answers herein contain on a trip across the country)

Clue to how "rate mortgage" is adjustable herein

A crossword editor has to be very careful when changing one--unlike this puzzle's editor, who was careless four times herein

A subject of puns herein

Thematic letter herein