Article 33 gave the power to the parliament(not state legislature) to restrict the fundamental right of the armed forces such as army,police,IB,BSF,etc.
The objective behind the article 33 is that to maintain the discipline in the armed force for the better protection of the country. Such laws are Army act 1950,Navy act 1950,Air force act 1950, and any such law made by the parliament can not be questioned in any court on the ground that it violate the FR of the armed force.
Some restricted Fundamental rights on the armed force are the Freedom of speech,Freedom to join organisation(political organisation),Freedom to attend the meeting and demonstration,Freedom to meet the press,etc.
A parliamentary law enacted under article 33 can exclude the court martial from The writ jurisdictions.