Translation assistance for Luxembourg March certificate?

SGM Mikel Dawson has the 'most correct' answer. If you get a translation issued by the source, then there should be no question regarding the award.

However, HRC will accept "official translations" as well. You can contact Military OneSource* and they will provide you with with free translation services for the document. How long it will take I have no idea, but it will be certified as an official translation. Contact them to get the ball rolling.

*edit* - CPT Box contacted them and they can do a translation turnaround in 3-5 business days.

Skip the Google Translate.
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* https://www.militaryonesource.mil/confidential-help/interactive-tools-services/language-services/document-translation-services-from-military-onesource/

Sir,
If I was you, I would reach out to the Issuing command, let them know you need a translation. I had to have one done for a Danish march. Got the issuing command to get me a translation, was G2G.

When I bought a timeshare from someone in Canada while living in the UK, I didn’t need anything notarised, just regular signatures via email and scanned copies. But on another occasion involving property documents for a contract overseas, they suddenly asked for notarisation and legalisation, which came out of nowhere. It definitely varies depending on the seller's location and, sometimes weirdly, what the local agent assumes is required.

When notarisation was needed, I didn’t go to the consulate. I ended up using a local firm that helped with notarising and also got the apostille sorted at the same time. I was using these folks that handle the whole process, including notary and apostille, in one go through https://apostillelondon.com/. Made it less stressful, especially with tight deadlines.