Does Operation Monsun, RSRD and OMEGU require SH 4 U-boat add on?

[Castout]

That's the question :DL

[Diablo2]

yes

[Sailor Steve]

Yes.

Op Monsun fleshes out the UBM part of 1.5 and makes it a full-blown Atlantic campaign, but it requires that the U-Boats be there in the first place.

[Castout]

Thanks