The question asks to match the acts with the actions.

Pair 1 correctly matches `Unauthorized wearing of police or military uniforms` with `The Official Secrets Act, 1923.` This act deals with espionage and offenses related to it, which includes impersonation of law enforcement or military personnel.

Pair 2 incorrectly matches `Knowingly misleading or otherwise interfering with a police officer or military officer when engaged in their duties` with `The Indian Evidence Act, 1872.’ This act deals with rules on admissibility of evidence in Indian courts, not with obstructing law enforcement officers.

Pair 3 correctly matches `Celebratory gunfire which can endanger the personal safety of others` with `The Arms (Amendment) Act, 2019.` This act contains provisions punishing misuse of firearms, including endangering others.

So, the correct answer is `only two` as only pair 1 and 3 are correctly matched.