The Knights of Malta are faithful Catholics, and faithful Catholics can’t be Freemasons.
What about the Knights who say “Ni”?
Well, kind of.
The Knights Hospitlier tried to stay fairly neutral in the various spats over Roman authority — anyway they had lots of Scottish knights and they went with the Scottish king (Bruce? Robert? Robert the Bruce?) who ended up being excommuicated.
Anyway, the KOM divided like most of Christendom, and there have been resulting divisive claims to “who is the correct heir to the order” since then -— nominally protestant claiming one thing and Roman Catholics saying the other.
I have no idea or now care who is correct.
I do note that the Protestant group tries to rise above this and promises to protect ALL Christiandom (and, in particular, Christian pilgrims), REGARDLESS of denomiation.
There are larger numbers of KOM in our military, including a recognized encampment within an Army Division that is in Iraq.