HH-1K "Iroquois"  - Bell Model 204
Vietnam Nickname:  "Sealord"

Height:  14 feet, 7 inches
Length:  42 feet, 7 inches
Empty Weight:  4,750 lbs
Hook Load Limit:  5,000 lbs
Maximum Weight:  8,500 lbs
Performance:  Lycoming T53-L-13 1,400-lb turboshaft engine
Ceiling:  16,700 feet
Speed:  138 mph
Range:  212 miles with maximum fuel
Armament (Varied Among Helicopter Attach Light (HAL)
"Seawolves" Units):  
Depending on need, mini-gun on pylon and/or single or dual M-60
machine gun mounts.  Some operated air-cooled .50 caliber
machine guns.

These were US Navy sea/air rescue helicopters.
First delivered in May 1970. Total produced - 27.

Vietnam:

The Sealords were flown in various missions in Vietnam:  Logistics, SEAL inserts, SAR, medivac, and others as directed.  The Sealords were actively involved with supporting the Seawolves, SEALS, and Riverine forces with their respective missions throughout the Mekong Delta.