There are many unfounded superstitions within the military. Don't eat Charms candy. Don't whistle on a Navy vessel. Pilots won't take off without being given a thumbs up. The list goes on.
Many of these superstitions have traceable roots that run back to a time when someone did something and terrible results followed, but there's seldom any empirical evidence behind the practices. To that end, Marines and Marine veterans from all eras and battlefields will all attest to one fruit being such bad luck that even uttering its name will cause them to freak out.
This fruit is, of course, the apricot.
Vietnam was bad enough. Even if you liked the taste of the fruit, you probably shouldn't do anything to make everyone ostracize you.
While most troops tend to stay away from apricots — typically referred to as 'cots, forbidden fruits, or A-fruits, to avoid being jinxed by uttering its true name — the biggest contributors to this superstition are Marine tankers and Marines on Amphibious Assault Vehicles.
Officially, the myth began in WWII. Many of the AAVs that were hopping around the islands of the Pacific would carry the fruit, as it was often found in rations. All the AAVs that were destroyed with their crewmembers inside were said to have a single piece of cargo in common: apricots. Of course, there isn't much proof to back up this statement, as many vehicles that didn't carry the forbidden fruit met the same fate.
The superstition continued into the Vietnam War. There, Marines were hesitant about even being near someone eating a 'cot because they thought it meant that rockets or artillery were soon incoming. The belief was so strong that Marines would often force someone out of the tent if they tempted fate by biting into one of the stone fruits.
You still won't find any of them in a Marine Corps chow hall. Just grab an apple, they taste better and probably maybe won't cause everything to explode or break down. Probably.
(U.S. Marine Corps photo by Cpl. Janessa K. Pon)
It was also said that 'cots were to blame for many Marines vehicles breaking down during the Persian Gulf War and the early days of the Global War on Terrorism before they were all but banned by the military overseas.
Until apricots were removed from MREs in 1995, many Marine tankers would opt out of bringing MREs into their vehicles altogether on the off chance that the A-fruit was hiding in one of the sealed bags. The myth continues to this day, and most Marines won't even utter the name of the fruit, let alone touch them.