"M.L.L." reinforcements

[sionyn]

Hi,

Please forgive my ignorance, but I keep coming across this term on soldiers records: "M.L.L." rfts (with the letters M.L.L. actually being enclosed by inverted commas) and I've also seen it written elsewhere as "Serbian MLL reinforcements"

It usually occurs as the first line on a soldiers casualty record (on Army form B. 103) e.g.:

Embarked S'thampton 10/9/16. Disembarked Salonika 31/9/16. H.S. "Essequibo" with "M.L.L." Rfts. [see image below]

I've searched online and through the various GWF pages and have been unable to find an answer - what does "M.L.L." stand for and why is it in inverted commas?

Sion