A little background information (if not interested, skip to the next paragraph): Being stationed in Germany has many opportunites for foreign awards, not least of which are the coveted German Shooting Badge and the German Army Badge for Military Proficiency. Among some rather popular things as well are the memorial marches from our own forces in the Battle of the Bulge and the "In The Footsteps of the 82nd Airborne Division" while towering above any march that may otherwise come to your mind, is the Nijmegen Four Days March. If you are unfamiliar with it, it is approximately 25 miles a day for four days totaling a nice 100 mile march. At the successful conclusion, all participants are awarded a nifty Nijmegen Cross which is actually a royal award and recognized by that country's military which leads to my next paragraph.
According to AR 600-8-22 Appendix E on page 172 under 'Netherlands' there is listed "Holland Four Day Event Cross" as being authorized for wear in uniform. Is that terminology referring to the above described 'event'? I have not found any reference that calls it by that name on the event website/history.
Also, I have sent an email to USAHRC, AHRC-PDO-PA in Alexandria Virginia for clarification on the AR's wording.