The ghosts of Brazil's dictatorship are stirring in the wake of President Michel Temer's order for the army to take over policing in Rio de Janeiro.
There's no direct comparison between the Rio operation and the 1964 coup that brought two decades of military rule to Latin America's biggest country. In this case, the military isn't overturning a president -- it's just taking charge of Rio state's security situation after months of escalating crime.
But the echoes have been loud enough to force the government into extraordinary denials.
"I'm going to tell you how many marks I give the idea of a military coup: zero," Temer told Radio Bandeirantes on Friday. The center-right president went on to say that there was "no mood" in the military or population for a coup.
Some 8,500 troops arrived last July in an ongoing deployment to help with operations in favelas, the latest of which took place Friday in western Rio. During the 2016 Olympics, troops focused on securing tourist areas, patrolling with rifles among the bathing-suit clad crowds of Copacabana and Ipanema.
But the "intervençao," as it's called in Portuguese, is different this time.
Now the army isn't only helping out -- it's taking full charge, with generals replacing the entire civilian leadership of the police.
But there are still widespread fears that military intervention will become a blunt instrument endangering poor and defenseless people in the favelas, while doing little to eradicate narco gangs.
A short video made by three young black men about surviving encounters with police -- including advising against carrying a long umbrella that could be mistaken for a gun -- went immediately viral on social media.
"The intervention in Rio is an inadequate and extreme measure that causes concern because it puts the population's human rights at risk," said Amnesty International's director in Brazil, Jurema Werneck.
Temer made it clear Friday that the army will use deadly force when justified. But rights activists, weary after years of botched police operations and stray bullets, ask who will hold the soldiers to account.
The army wants troops to be subject only to military courts, while the police it is working alongside have to face regular courts.
Adding a politically explosive twist to that already complex issue, the army's top commander, General Eduardo Villas Boas, said this week he wants "a guarantee of being able to act without risking a new truth commission."
He was referring to the National Truth Commission, a body set up by then leftist president Dilma Rousseff to examine appalling human rights abuses committed during the military dictatorship.
Many saw the commission as a way to air painful memories and promote reconciliation, even if an amnesty meant that confessed torturers revealed in the commission's final 2014 report could not be tried.
Villas Boas, however, revealed the army's nervousness and perhaps lingering resentment.
Another key figure in the Rio intervention -- Temer's security minister Sergio Etchegoyen -- has previously lambasted the truth commission's report as "pathetic."
Etchegoyen's father, Leo, served in high positions during the dictatorship, while an uncle allegedly headed the so-called "House of Death" -- a property near Rio where mainly far left political prisoners were fatally tortured.