Earlier quoted context omitted.
This interests me (in a slightly off-topic way): do the soldiers really switch their service weapons to a semi-automatic model in order to patrol, or are all the rifles within the military police (etc.) semi-automatic only?
I suspect that you're mistaken on what semi-automatic means. Basically all of the rifles likely to be carried by law enforcement are semi-automatic, except for sharp-shooters, who my carry a single-shot with a floated barrel. Semi-automatic is not automatic, and has no burst or rapid-fire mechanisms. All semi-automatic rifles shoot one bullet for each pull of the trigger, and in 2015, that's the norm for just about e…
If I had to guess, I'd say they would prefer using the weapons they are accustomed to, which are probably not the same that LEO's use. Now I don't know much about the French military, but where I come from, I doubt the military even has appreciable amounts of semi-automatic rifles, as even the military police always use the same assault rifle everybody else does.