Polish OOB:
037 K9PL Krab - the name is very wrong. It is just Krab (some call it AHS Krab, but it's unnecessary, AHS = SP gun-howitzer). K9 is a different Korean vehicle.
Starting date might be actually 12/12 (now 1/16), when the first 8 guns were given to military trials in an unit (on old chassis still). However, before 8/17, when the first battalion was given to the combat unit, it should have radio code 3.
Poland bought also original
K9A1, delivered to combat units from 12/22, operational (after first fire trials) from 3/23. It should be copied from Korean OOB 045 unit, gun should be the same 155/52 as Krab, AAMG presumably #176 50cal M2 AAMG. Name K9PL was reserved for a future version produced partially in Poland.
Polish
Piorun SAM (unit 212) were sold to
Norway and delivered in 12/23, so I suppose they could use them at once since 1/24 (according to Polish nTW 1/2024 article).
BTW: according to the article and Norwegian Wikipedia
https://no.wikipedia.org/wiki/Robot_70 and articles quoted there,
RBS-70 were used by
Norway only until 2004 (then sold to Lithuania), while Mistrals were used on ships only. After 2004 Norway had no infantry SAMs.