Maratha Light Infantry was created in 1922.
King's Own Yorkshire Light Infantry ended in 1968.
I would say no. The term light infantry implies mobility overland. Marine units of some countries may be designated as light infantry, but most marines today are primarily for the establishment of a beachhead. They move a short distance from ship to shore, not strictly infantry, and they are rather heavy.
he joined the durham light infantry because they were for the people who wear under 5ft 3ins
If you are talking about the Spartans at Thermopylai, they had 300 hoplites (heavy infantry), 2,100 light infantry, and there were about 7,000 from other Greek cities. The Saprtan 300 heavy infantry were the personal bodyguard of King Leonidas. The rest of the Spartan army was kept at home to protect against the threat of an amphibious attack by the Persian navy.
The word infantry does not have an antonym.
The Light Infantry was created in 1968.
Durham Light Infantry was created in 1881.
Light Infantry Brigade was created in 1948.
Washington Light Infantry was created in 1807.
Highland Light Infantry was created in 1881.
Rhodesian Light Infantry was created in 1961.
Somerset Light Infantry was created in 1881.
West Kent Light Infantry was created in 1758.
Duke of Cornwall's Light Infantry was created in 1881.
Sri Lanka Light Infantry was created in 1881.
Highland Light Infantry of Canada was created in 1886.
King's Own Yorkshire Light Infantry was created in 1881.