. >> we're in baltimore, at historic fort mchenry. during the war of 1812, this is where the battle was fought that inspired francis scott key to write "the star-spangled banner," so it's the perfect place to learn about the right way to handle our flag. patrick rawle is a park ranger. but today, he's wearing a uniform from colonial times. don't let that bright-red color confuse you. >> to arms! the redcoats are coming! the redcoats are coming! >> so, could you explain your uniform for us? >> i am dressed as a musician in the united states corps of artillery. musicians wore red so officers could easily spot them on the field of battle. all right, guys! one quick thing! when the flag starts to pull as i'm raising it, you got to let go, okay? >> do you raise the flag every single day, even if no one's here? >> that is correct. we are mandated by law. president truman, in 1948, declared that fort mchenry should fly the flag 24/7, 365 days. >> like our country, our flag has changed a lot through the years. how long has the flag looked the