If you mean grammatically correct, no. There is no explicit subject or verb. But this kind if phrase is used in colloquial speech, particularly that of uneducated people. However it would be considered incorrect writing in any primary school.

To state it with some erudition: "I have great respect for heroes who defended their country." or "Everyone should give great respect to heroes who defended their country."

The mark of a good education is to speak and write grammatically correct sentences.

It's not formal English, but it's a kind of slang that would be understood by anyone in the US/UK.