I have had these challenge coins in the drawer for years, came from SF Capt. Robert Jewell. Happened to see them on ebay and was shocked at the asking price. Jewell had some time with Delta Project,  Jewell carried the 5th coin as it shows some wear, but the Delta has always been in a holder.   I have no idea on value, any help....   Thanks,   Tim

Relisted, USS Kitty Hawk, CV-63 , "PRESS ON"  

Not a lot of information on these three RPPCs.  They're all 80th Division men, seemingly 318th Infantry, from the Federicksburg, VA area.  Of the two men together, the left with the cane also has a wound chevron.  The first two are French, the group photo was made by a Richmond studio.    

From the same seller, a second pairing, Nice buckle / patch combo up on the 'bay. USS Tautog, SSN-839, Named to: PO UPCHURCH M.D.  

This photo was pretty mulched, but cheap and had a name on the back.  2nd Lt. Harry Chandlee Snodgrass, Sanitary Corps.  Born, raised, and died in the District of Columbia.  In civilian life he was an employee of the Pan-American Union, something that continued like the "small mustache" (mentioned in his WWII draft card) into the 1940s.  He died in 1977 in the District.  During WWI he served with the Attending Surgeon's Office in DC.  That office supplied all medical care for US Army personnel and their families, civilian employees and their families, plus all retired personnel living in the district.  During WWI the office expanded from one dispensary to four plus eleven emergency rooms in Army facilities in the Military District of Washington.   Also identified on the back was Assistant Surgeon (LTJG) Stewart L. Jeffrey, Naval Medical Corps Reserve.  The single bar is visible but the leaf behind is pretty hard to make out. Dr. Jeffrey was a physician in Coconut Grove, FL and a member of the Florida Naval Militia's Miami Division.  He entered active duty service in 1917 and served until 1920, returning the reserves while stationed at Marine Barracks Paris Island.  He spent many summers as attending physician at the Mount Washington Hotel and Bretton Woods before passing away in 1959.   Final recently acquired photo, this unknown 318th Infantry veteran from Fredericksburg, VA area with his discharge chevron and very nice 80th Division patch.

WWI era photo of AEF troops in France, the doughboy in the front middle has a Grenade vest

The 3 armed triangle is a UK military acceptance mark, sometimes called a crow's foot.  The 1944 is the year the scabbard was made/accepted into service.  The "8" under the left crow's foot is most likely the inspector's mark.   I've seen lots of "mismatches" or "cross-matching" knives and machetes.  Whether it is truly a mismatch is debateable.   As to "mis-matching", in reality, you use what you have.  Thousands of machetes (and tons of other stuff) were made and sent to the UK during the WW2 under the Lend-Lease program, as well as the US buildup for European action.  Scabbards were made and issued to those who needed them.  The same model of scabbard might have been issued for several machete models.  Maybe the US sent machetes and no scabbards so the Brits had them made.  Maybe a US soldier "liberated" a nice leather scabbard while in England, or a British soldier said. "OOH, look, an orphan machete.  I have a home for it."    Without documentation, you just have a nice 1250 and a nice leather scabbard.  I have a nice shelf for it if you want to get rid of such a mashup. 😁

This looks AI enhanced.-generated. Boehm only wore jump wings at this time as a qualification badge. I assume the insignia on the beret was a USN officers small eagle and crossed anchor and what we see here is AI generated. Most of the original photos I have seen are not clear enough to make out the beret insignia and are black and white. Here is Boehm around the same period   

Nice buckle / patch combo up on the 'bay. USS Tautog, SSN-839, Named to: UPCHURCH

Those are called Sword covers.  The sword and scabbard are slid down into  it and either stored in that manner or slid inside a leather sword case for transport.   They are different lengths to accommodate swords of different lengths.   They would have been used for almost any type of saber or sword that fits them.  I  got one with my Texas A&M University etched M1902 Army saber in 1973.   I also got one with my M1852 USN Officer's Sword along with the leather transport case in 1977.  Other than one is a dull gray and the other a dark grey, and a couple of inches different in length, they are identical to your two.   The wider mouthed style is "probably" designed for a bell guard, as are on M1852s, or multi-knucklebow hilt style as found on the M1840 cavalry saber.  A single knicklebow hilt, as found on the M1902, only need a narrower opening.