Letica was born in 1926 in Podgora, where he was involved in creating a Partisan Navy in 1942.

He was Fleet commander, he was chief of a naval region, and before his retirement he served in Generalštab of JNA.

The long-time experience of Letica was precious for Croatia when the Croatian Navy was established in 1991.

On 12 September 1991, the President of the Republic, Franjo Tuđman, named him Commander of the Croatian Navy.

Sveto Letica is buried in Lovrinac graveyard in Split.