In this March 10, 2017, file photo, Marine Corps Commandant Gen. Robert Neller speaks during a news conference at the Pentagon. (AP Photo/Cliff Owen, File)
FILE- In this undated file photo provided by the U.S. Marine Corps, Tyler Jarrell, 18, poses for a photo. Jarrell was killed in a thrill ride accident at the Ohio State Fair on July 26, 2017, in Columbus, Ohio. Family and friends gathered in Grove City on Tuesday, Aug. 1, for the services for Jarrell. Police officers and U.S. Marines were there to honor the young man who had recently enlisted in the Marines. (U.S. Marine Corps via AP, File)
In this undated photo provided by the U.S. Marine Corps, Tyler Jarrell, 18, poses for a photo. Jarrell was killed in a thrill ride accident at the Ohio State Fair on Wednesday, July 26, 2017, in Columbus, Ohio. The Marine Corps and school officials said Jarrell enlisted last week and was going to begin basic training next summer after his high school graduation. (U.S. Marine Corps via AP)
In this undated photo provided by David Taylor Sr., former Marine David Taylor poses for an official portrait while in the Marine Corps. David Taylor Sr. told The Associated Press on Tuesday, July 25, 2017, that he was notified by the U.S. State Department that his son was killed earlier this month in Syria while fighting for a Kurdish militia battling the Islamic State group. (U.S. Marine Corps/David Taylor Sr. AP)
This combination of undated photos released by the U.S. Marine Corps on Friday, July 14, 2017, shows eight of the 16 the victims killed in a military plane crash earlier in the week in Mississippi. They are, top row from left, Cpl. Dan Baldassare, Staff Sgt. Robert Cox, Capt. Sean Elliott and Maj. Caine Goyette; bottom row, from left, Gunnery Sgt. Mark Hopkins, Sgt. Chad Jenson, Gunnery Sgt. Brendan Johnson, Sgt. Julian Kevianne. (U.S. Marine Corps via AP)
This combination of undated photos released by the U.S. Marine Corps on Friday, July 14, 2017, shows eight of the 16 the victims killed in a military plane crash earlier in the week in Mississippi. They are, top row from left, Cpl. Staff Sgt. William Joseph Kundrat, Sgt. Talon Leach, Sgt. Owen Lennon and Navy Corpsman Ryan Lohrey; bottom row, from left, Sgt. Joseph Murray, Cpl. Collin Schaaff, Sgt. Dietrich Schmieman and Staff Sgt. Joshua Snowden. (U.S. Marine Corps via AP)
South Korean President Moon Jae-in, left, with his wife Kim Jung-sook, and Marine Corps Commandant Gen. Robert B. Neller, center, place their hands over their hard during the playing of national anthems for South Korea and the United States during a ceremony at the "Chosin Few Battle Monument," at the National Museum of the Marine Corps, Wednesday, June 28, 2017, in Triangle, Va. (AP Photo/Alex Brandon)
A new ad by the U.S. Marine Corps makes a specific point to highlight women in combat, whereas past commercials featured them in training environments. (YouTube, Marine Corps) ** FILE **
This undated still image from a TV advertisement provided by the U.S. Marine Corps, is part of a new recruitment ad campaign by the Corps, meant to draw millennials by showing Marines as not only strong warriors but good citizens. "Battles Won" is the name of the campaign that includes TV ads and online clips of Marines unloading "Toys for Tots" boxes and real video of a Marine veteran tackling an armed robber. The military's smallest branch is also considering replacing its iconic slogan, "The Few. The Proud. The Marines." (U.S. Marine Corps via AP)
This undated still image taken from video for a TV advertisement, provided by the U.S. Marine Corps, is part of a new recruitment ad campaign by the Corps, meant to draw millennials by showing Marines as not only strong warriors but good citizens. "Battles Won" is the name of the campaign that includes TV ads and online clips of Marines unloading "Toys for Tots" boxes and real video of a Marine veteran tackling an armed robber. The military's smallest branch is also considering replacing its iconic slogan, "The Few. The Proud. The Marines." (U.S. Marine Corps via AP)
This undated image provided by the U.S. Marine Corps, shows a billboard the Corps will post as part of a new recruitment advertisement campaign, meant to draw millennials by showing Marines as not only strong warriors but good citizens. "Battles Won" is the name of the campaign that includes TV ads and online clips of Marines unloading "Toys for Tots" boxes and real video of a Marine veteran tackling an armed robber. The military's smallest branch is also considering replacing its iconic slogan, "The Few. The Proud. The Marines." (U.S. Marine Corps via AP)
This undated image provided by the U.S. Marine Corps, shows a billboard that the Corps will post as part of a new recruitment advertisement campaign, meant to draw millennials by showing Marines as not only strong warriors but good citizens. "Battles Won" is the name of the campaign that includes TV ads and online clips of Marines unloading "Toys for Tots" boxes and real footage of a Marine veteran intercepting a robbery. The military's smallest branch is also considering replacing its iconic slogan, "The Few. The Proud. The Marines." (U.S. Marine Corps via AP)
This undated image provided by the U.S. Marine Corps shows a billboard that the Corps will post as part of a new recruitment advertisement campaign, meant to draw millennials by showing Marines as not only strong warriors but good citizens. "Battles Won" is the name of the campaign that includes TV ads and online clips of Marines unloading "Toys for Tots" boxes and real video of a Marine veteran tackling an armed robber. The military's smallest branch is also considering replacing its iconic slogan, "The Few. The Proud. The Marines." (U.S. Marine Corps via AP)
FILE- In this May 5, 2014, file photo, a U.S. Marine Corps Color Guard stands under a Marine Corps emblem in Jupiter, Fla. The Defense Department is investigating reports that some Marines shared naked photographs of female Marines, veterans and other women on a secret Facebook page, some of which were taken without their knowledge. Marine Corps Commandant Gen. Robert B. Neller on Sunday, March 5, 2017, called the online activity "distasteful" and says it shows an "absence of respect." (AP Photo/Wilfredo Lee, File)
In this image provided by the U.S. Marine Corps, Vice Adm. Robert S. Harward, commanding officer of Combined Joint Interagency Task Force 435, speaks to an Afghan official during his visit to Zaranj, Afghanistan, Jan 6, 2011. Harward has turned down an offer to be President Donald Trump's new national security adviser, the latest blow to a new administration struggling to find its footing. A senior White House official said Feb. 16, 2017, that Harward had turned the offer down due to financial and family commitments. (Sgt. Shawn Coolman/U.S. Marine Corps via AP)
The Marine Corps' classic recruiting slogan, "The Few. The Proud. The Marines," may end with a new advertising campaign approved by Commandant Gen. Robert Neller. (Instagram, United States Marine Corps)
Marine Corps Forces Special Operations Command will now have its own insignia, which features the motto "Spiritus Invictus," or unconquerable spirit. (U.S. Marine Corps)
U.S. Marine Corps 2nd Lt. Daniel Mora trains at the Jungle Warfare Training Center on Camp Gonsalves, Okinawa, Japan, Aug. 21, 2009. (U.S. Marine Corps) ** FILE **