The White House says retaining troops who may require substantial medical treatment "presents considerable risk to military effectiveness and lethality."
No evidence of violence was found in the deaths at a condominium near the Caribbean coast town of Tulum, Mexican officials said.
The ride at a Kansas water park had already injured more than a dozen people before a 10-year-old boy was decapitated in 2016, the indictment says.
Demonstrators enraged over the shooting of the unarmed father-of-two locked arms and blocked entry to the Kings' arena.
"Let us pray with our legs, let us march in unison to the rhythm of justice, because I say enough is enough," said one Parkland shooting survivor.