The crisis in Zambia prompted PLAN to relocate its headquarters from Lusaka to Lubango, Angola, at the invitation of the MPLA. It was joined shortly afterwards by SWAPO's political wing, which relocated to Luanda. SWAPO's closer affiliation and proximity to the MPLA may have influenced its concurrent slide to the left; the party adopted a more overtly Marxist discourse, such as a commitment to a classless society based on the ideals and principles of scientific socialism. From 1976 onward SWAPO considered itself the ideological as well as the military ally of the MPLA.