The best part of the fourth of July can be the worst for some veterans

There's no doubt the Fourth of July is a day to celebrate those who have defended our nation's independence, but one nonprofit wants to remind Americans that fireworks can create stress for military vets.

Last year, the organization, called Military with PTSD, distributed 4,372 yard signs free of charge to veterans who requested them, according to its Facebook page.

Experts say fireworks can trigger "a range of reactions" including "becoming more alert and vigilant" and "even flashbacks" in some combat veterans.

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4th of July 2017: Celebrity Snaps
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4th of July 2017: Celebrity Snaps
Hope you all had a great 4th! 🇺🇸
Happy 4th y'all! #GoldenHour @avaphillippe ❤️❤️🇺🇸
#ThisGuy #WeHonorOurCountry #IConnorOurCountry #GoodHairDay #IndependenceHairDay #LoraxHairDay #PatrioticLoraxHairDay #TheSpiritOfThePatrioticNantucketLoraxConnor #RedWhiteAndHairDo #GettingWiggyWithIt #WiggingOutOnTheFourth #LetFreedomWig #McSquad #McD4th2017
Happy Fourth! 🇺🇸🎉👍
The only time I don't mind giving up #independence lol #happyindependenceday #fourthofjuly 🇺🇸🇺🇸
Happy Birthday America 🇺🇸! So thankful for good friends @kirastokesfit & @garyjac for letting me crash their 4th of July last minute. #NY #4thofjuly - sweet tank by @thelightblonde
Happy 4th!!!! Photo cred: @niecynash1 ❤
SWIPE➡️ Love & Foolishness in the air❤💙❤ @gabunion @dwyanewade
Happy #independenceday America! We love this great land! Praise the Lord for freedom! #4thofjuly @derickdillard @duggarfam @cldilla
Happy 4th of July!!! ❤️🇺🇸💥 Love, The Lacheys (Phoenix was under the weather but is always with us in our hearts!) 👶🏻😍❤️ #LacheyPartyOf5
Happy fourth
What's more American than apple pie, hot dogs, baseball and plank stack push-ups?! 🇺🇸 @kirastokesfit
Happy 4th of July everyone!!! Having a little fun in the sun with my best girl today!!! Enjoy!! 🇺🇸❤️
Happy 4th of July y'all! #4th
Happy 4th of July America!!!! I love this country ♥️♥️♥️
Cheesin with the fam ❤️ Happy Birthday America 🇺🇸
Here is the annual eagle dress pic. Happy Birthday to this great country of ours and I hope you all had a very #Happy4thofJuly!!! Now time for fireworks. 🇺🇸🎇💥🎇💥🎇💥🎇
Happy 4th ❤️
#happy4thofjuly #jammies
I may not be American, but if you know me - you know I love a celebration especially when it means coordinating outfits, eating burgers and basking in the sun! Happy 4th!!! What's your favorite holiday?! #fourthofjuly #canada150 🇨🇦🇺🇸 #ShaycationMykonos
Happy 4th of July. So grateful for our hard fought freedoms. #america #birthday
Three Cheers for the Red White and Blue! Happy 4th of July Everybody! Hope today has you smiling so big your cheeks pop your sunglasses off your face too! 😎🇺🇸🗽⭐️❤️💙💥💄💋⛵️🥂🍾⭐️💥❤️💙🍉And may your 🌽be knee high on the 4th of July! 🇺🇸😎🗽🥂🍾💙❤️💥
Life, liberty, and the pursuit of Happiness!! Happy 4 th to all! With love ❤️
Happy b-day America! Pretty beach @dunedeckbeachclub hamptons-next stop @ninawcooper kitchen she makes best burgers on the grill!
Happy 4th of July!! ❤️💙🇺🇸 @m_rutler
🇺🇸🎆🎇💙 @m_rutler
Humidity levels as high as my ponytail #Happy4th 💥
All of this. Happy 4th of July 🇺🇸
Happy 4th of July! #budweiser
"oh shit it's moving" Happy 4th of July!❤️💙
Happy 4th of July from Idaho 🎉🎊❤️🇺🇸
Happy 4th!
Happy Independence Day! I am a proud citizen. 🇺🇸
Happy 4th of July Everybody! #greatestcountryintheworld🇺🇸
Wishing you all a star spangled peace filled holiday with a touch of inappropriate under to outer garment ratio 🇺🇸 ⭐️👅
It's a party in the USA 🇺🇸🇺🇸🇺🇸
Happy 4th ! Everyone be safe !!! LOVE 💙💙
Grill master. Who else is BBQ’n? Happy 4th of July everyone! 🇺🇸🎆
Powerful and emotional day for me and my family at the National Center for Civil and Human Rights in Atlanta, GA. Took a long moment here and closed my eyes while the church hymns played thru the speakers paying respect to these four beautiful little girls who were killed by falling rubble after a bomb exploded at the 16th Street Baptist Church in Birmingham, Alabama in 1963. Couldn't help but shed a tear thinking about my own young daughters and how I live to provide for and protect them. It's how we all feel about our babies. Provide, educate, protect and love. Celebrating our country's independence I wanted to dig a bit deeper to gain more knowledge/perspective on our history. Really grateful I did. Enjoy your families today. 🇺🇸
‪Behold: the pegasus of light beers has arrived. #HeinekenLightPartner #Coolerpack‬
Happy Fourth of July!!!!! 🇺🇸🌻
#TheFirstRuleOfTheNantucketWaterFightClub is #DontHashtagAboutNantucketWaterFightClub #PetersTheMan #TheWaterBombsBurstingInAir #GaveProofThroughTheEarlyAfternoon #ThatOurFlagThemedVisorWasStillThere
Happy 4th!!! A happy day it is! @eddiecibrian @theminimaleanimale #happy4th #4thofjuly #happiness #hubbylove
Thx @doordash. Moms in the pool where they belong. 🏊🏻‍♀️🏊🏻‍♀️🏊🏻‍♀️🏊🏻‍♀️🏊🏻‍♀️🏊🏻‍♀️🏊🏻‍♀️🏊🏻‍♀️🏊🏻‍♀️🏊🏻‍♀️

Military with PTSD founders say they don't want to stop fireworks, but they do hope neighbors will give these veterans a heads up.

One veteran told NBC: "On the Fourth of July, I'm going to pop my own fireworks. But when you get woken up at two, three o'clock in the morning, it brings back those memories."

According to the Department of Veterans Affairs, between 11 and 20 percent of military veterans who've served in the Vietnam War, the Gulf War, Iraq or Afghanistan suffer from post-traumatic stress disorder in a given year.

This video includes clips from the U.S. Army and the U.S. Marine Corps and images from Getty Images. Music provided courtesy of APM Music.

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