How does the author use foreshadowing in I Know This Much Is True?

Seen only on television and in the newspapers, Operation Desert Shield is a
multinational buildup of forces in the Persian Gulf beginning in August 1990, as a
response to Iraq's invasion of Kuwait. Its immediate purpose is to protect Saudi Arabia against attack, with a longer-range goal of preparedness for war with Iraq—"Operation Desert Storm." Narrator Dominick Birdsey views it as Vietnam II, and his brother Thomas' psychiatric caseworker, Lisa Sheffer, foresees it as another "war that keeps on giving" psychological casualties.