Answer:

wartime

Answer	Crossword Clue
WARTIME	Setting for some History Channel programs
WARTIME	Period of conflict
WARTIME	When travel is restricted

WARTIME	When the lights go out.
WARTIME	Part of the 1940's.
WARTIME	Period of strife.
WARTIME	Early 40's, e.g.
WARTIME	1941-45, for the United States
WARTIME	When it may be unsafe to travel
WARTIME	When there may be censorship
WARTIME	Period of major fighting

WARTIME	"The last thing I wanted to do was to be a ... president": Lyndon Johnson
WARTIME	The early 1940s, for example
WARTIME	1941-45, for the U.S.