All 7 Uses

brief
in
Flags of Our Fathers
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Briefings are common; captains and sergeants going over the plan of action on the beach with their huddled squads and platoons, again and again.†
Chpt 6.
In that capacity he occasionally called the other corpsmen together for a briefing, to relay news, to go over procedures.†
Chpt 6. *
But briefings got old; there wasn't much news, and by now the other corpsmen knew their procedures.†
Chpt 6.
As Easy Company with their khaki shirts neared their destiny, seventy civilian correspondents gathered in the steaming wardroom of the command ship Eldorado anchored off Iwo, for a final briefing.†
Chpt 6.
Bowman was giving a final briefing to the platoon leader who was relieving him so that he could head for the offshore transport and passage back home.†
Chpt 13.
During Ira's initial briefing at Marine Barracks, at Eighth and I Streets, he was shown the enlarged photograph of the flagraising.†
Chpt 15.

Uses with a meaning too common or too rare to warrant foucs:

The dedication of the Iwo Jima monument at Arlington provided Ira with a brief moment of public dignity; his last, as things turned out.†
Chpt 19. *

Definitions:

(1) (brief as in: briefed her)
to give a summary of important information to someone
(2) (brief as in: legal brief)
a summary of important facts -- especially an opinion of a legal case
(3) (meaning too common or too rare to warrant focus)
Brief is most commonly encountered as an adjective meaning "of short duration." Other meanings derive from the idea of short--as when making a long story short by summarizing it, or when wearing briefs (underwear).