Answer: It has protections to keep the military from taking power again.
Step-by-step explanation:
The Constitution of Brazil was a response to the military dictatorship. Therefore, it attempted to ensure individual rights and reduce the state's power over people´s freedom.
In opposition to the tyrannical reasoning of the elder Constitution, the new one designed several constitutional mechanisms to prevent any kind of coup, such as the mentioned requirements for presidential candidates who come from the army.