Argentina had a conscript army at the time, so they had little choice about participating in the invasion and being part of the junta's regime. The officers were a different matter of course, they were volunteers yet despite that when it came to the actual fighting most of them abandoned their troops and headed to Port Stanley to surrendered quietly after the battles had been fought. From the Spiegel piece:
"Our own officers were our greatest enemies," says 44-year-old Ernesto Alonso. They supplied themselves with whiskey from the pubs, but they weren’t prepared for war. "They disappeared when things got serious." Many of the officers had previously worked as torturers for the Argentianian [sic] dictatorship. "They used us recruits for their sadist phantasies [sic]," Alonso says.If the Argentinian government is really interested in being able to honour their veterans then they could start by treating the living ones appropriately, but of course that isn't their motivation here, they are trying to whip nationalistic fervour to distract from the situation at home, just as they were 26 years ago.