well, classification is a little confusing at times, as it depends more on the requirements, rather than what it would be called.... the new Steregushchy-class corvettes (2,200t) of the Russian Navy are bigger than our Type 053H2 frigates..... corvettes are actually light frigates (FFL/FLG), nothing else.... it depends on what you call light and what you don't.... the purpose of our Durjoy-class is more like a corvette, but because of their size (64m, 650t) they were designated LPC.... their pennant number is also in "P", rather than "F".... the Bijoy and Dhaleswari (Castle-class) have pennants of "F"..... it matters little, as long as it serves the purpose..... the US Navy as dumped frigates altogether, and went for the brand new type - Littoral Combat Ship (LCS)..... anyway, too much talk for this designation stuff..... be cool....