The simple predicate is "are interested".
'A U.S. Engineer' would more than likely be referring to the fact that they ride/control locomotives.
Answer:
He has facial differences and a severe form of Treacher-Collins syndrome.
Explanation:
About 1 in 50,000 people have this syndrome. In August's case, his eyes and cheeks go lower than the normal person's, and he often gets ignored or made fun of because of this.
