[2] Six days later, manned by Spanish–American War and Boxer Rebellion veterans along with a large number of raw recruits, they set sail for France.

They participated in campaigns and battles such as Bois de Belleau, Vierzy, Château-Thierry, Pont-a-Mousson, Limey Sector, Fleury, Meuse-Argonne, Blanc Mont, St Michiel, Leffincourt and Soissons.

The fighting in World War II found the Marines of 3/5 at Guadalcanal, New Britain, Peleliu, and Okinawa.

En route home from hostilities, 3/5 participated in Operation Sea Angel, delivering critical food, supplies, and humanitarian assistance to the cyclone-ravaged country of Bangladesh.

In November 2004, the battalion, along with several other units, participated in Operation Phantom Fury (also known as Al Fajr (Dawn)) and was part of one of the biggest battles in Iraq to that time.

[1] On June 20, 2006, seven Marines and a Navy Corpsman of Kilo Company were charged with the April 26, 2006, murder of disabled Iraqi civilian Hashim Ibrahim Awad, an event referred to as the "Hamdania incident".

[3][4] All eight faced additional charges of kidnapping, conspiracy, larceny, assault and housebreaking or unlawfully entering a dwelling.

On May 19, 2006, Darkhorse Marines captured three insurgents responsible for the kidnapping and detention of Jill Carroll, an American journalist with The Christian Science Monitor.

[5] In June 2006, Lance Corporal Reginal Dutt avenged the death of four 2/4 Marines Scout Snipers who had been killed on a rooftop in Ramadi in 2004.

In 2013, a Marine veteran Logan Stark of 3/5 released a documentary following the STA (Surveillance and Target Acquisition) platoon of the battalion.

Featuring interviews and combat footage from the engagements in Sangin, the documentary named For the 25 memorializes the 25 lost Marines during the battalion's seven-month deployment.

This article incorporates public domain material from websites or documents of the United States Marine Corps.