Question concerning retraining units

[Shahed]

If you replenish a unit, you get zero exp troops joining your unit.

I have tested this specifically with units upto 3 chevrons, I have a few units which are 4 chevrons. I haven't replenished those yet so I don't know if the same applies to units above 3 chevrons.

I can tell you with 100% certainty: units below 3 chevrons do lose exp if replenished (with enough zero exp men).

The drop in exp is pretty clear, just take any 10 man 3 chevron unit and rename it "test", hit the replenish button, park it somewhere safe, come back after two turns.