no
Flag day on June 14.
Yes, it is not a US Postal Holiday.
It is the US Flag Day, and also can be many people's birth day
It became a federal legal holiday in 1975
In the US it is a purely secular holiday, while in Ireland it is a legal holiday.
It is legal to display any flag in the US. This is a matter of freedom of symbolic speech.
Federal Holiday observed on Friday July 3rd according the US Office of Personnel Management.
Yes, it is legal in the US to fly a US, or other flag, from your car. Many people do that.
It is not a federal holiday as in a paid day off. It is a National Observance. Refer to federal law Title 36 US Code > Subtitle I > Part A > Chapter 1 for a list of this and other National Observances.
It is legal to fly the US flag on a pole in your yard, unless you are somehow doing so in a manner that is disrespectful of it.
President Dwight D. Eisenhower in 1954 .
Veterans Day is a US Federal holiday. This allows citizens to fly the US flag, participate in military ceremonies, decorate graves at cemeteries, attend parades.