When Does "Truth: Red, White & Black" #6 (2003) Take Place?
"Truth: Red, White & Black" #6 "The Whitewash" is a superhero comic-book written by Robert Morales that released June 18th, 2003. So when is "Truth: Red, White & Black" #6 set?
It takes place on the fictional Marvel Universe timeline roughly in the years:
We know this because the epilogue of the previous issue, "Truth: Red, White & Black" #5 (2003), flows directly into this issue and its setting is also the setting of this issue's main action. It is a largely unplaceable work other than fitting into the current 'present day' of the main Marvel Universe's Steve Rogers/Captain America.

2000s AD
We know this because the epilogue of the previous issue, "Truth: Red, White & Black" #5 (2003), flows directly into this issue and its setting is also the setting of this issue's main action. It is a largely unplaceable work other than fitting into the current 'present day' of the main Marvel Universe's Steve Rogers/Captain America.
Additionally, there is a flashback within this issue to 1942 AD.
This comic-book was retroactively collected into a hardcover and paperback re-titled "Captain America: Truth: Red, White & Black".
It is a chronologically midway comic in the Marvel Comics Universe multiverse timeline. It can be read after the previous issue, "Truth: Red, White & Black" #5 (2003).