Finnish Air Force F-35A Lightning II
HX Fighter Program

In December 2021 the Finnish Ministry of Defence selected the F-35A as the F-18 replacement for the Finnish Air Force.

Although nothing official is out yet, I am assuming the design will be...
Standard F-35 paint (Have Glass)
Small blue/white roundels similar to the Danish F-35 (which has colour rather than grey roundels)
Registration number on the fin like most other F-35s

My educated guess is that, if HaWks have codes starting HW-301, and HorNets have codes starting with HN-401, the LighTnings will be something like LG/LT/LN-501. LG was used already, LN could be confused with Lakenheath, so I'm going for LT-501 as the F-35 codes.