Read the following sentences carefully:
1) Maratha Light Infantry, one of the oldest regiments of the Army has entered its 100th year.
2) Maratha Light Infantry was the first infantry to be designated as a light infantry during the British Raj, for being swift-footed.
3) The regiment draws inspiration from the legacy of Maratha warriors. Feb 4 is celebrated as "Maratha Light Infantry Day" across the regiment throughout the country.
Which of the above sentence/sentences is/are correct?