Yes from like 1978 but
I suspect it is SA backed forceds not actually SA military .. maybe both
Here is actual equipment in SA army
https://en.m.wikipedia.org/wiki/Saudi_Arabian_Army
And they do hire mucho mercenaries to fight for them.
Notes from the link:
53 M1A2S. 20 were lost in Yemen
M60A3 (Patton) At least 37 are visually confirmed as being destroyed in Yemen.
AMX-30SA (French tank) In reserve. Though at least 3 are visually confirmed as being destroyed in Yemen.
M2 Bradley At least 57 lost in Yemen.
M113 At least 61 visually confirmed as destroyed in Yemen.
Oshkosh M-ATV several dozen have been destroyed in Yemen. With many being donated to Pro-Hadi forces and subsequently getting destroyed in fighting.