The 400th Seahawk delivered late last month was a MH-60R, an anti-submarine/anti-surface warfare variant.
"MH-60 multi-mission aircraft are among the most reliable and sophisticated maritime helicopters in the world," said Navy Capt. James Glass, the H-60 programs manager. "The Navy intends to continue flying these helicopters well into the 2030s."
The 400 aircraft include 166 of the R variant and 234 of the S variant, which is an armed utility helicopter that's used to carry cargo and personnel between ships. It is expected to operate in a mine counter-measures role next year.
The MH-60R, which came into service in 2002, will remain in production through 2017, Sikorsky said, while the S variant will remain in full-rate production through 2015.
"Mission success in the harsh maritime environment is a testament to the men and women of the U.S. Navy who fly and maintain these Seahawk aircraft," said Dave Zack, Sikorsky maritime programs director. "The skilled workforce at Sikorsky, and our supplier teammates, remains committed to building and supporting the world's most reliable, durable and operationally effective maritime helicopter."