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The seventh 40-ton Motor Torpedo Boat (MTB) built at Elco, she was laid down 4 March 1942, launched on 20 June, delivered to the Navy on 10 July 1942, and fitted out in the New York Naval Shipyard at Brooklyn. The Elco boats were the largest in size of the three types of PT boats built for U.S. use during World War II. Wooden-hulled, 80 feet long with a 20-foot, 8-inch beam, the Elco PT boats had three 12-cylinder Packard gasoline engines generating a total of 4,500 horsepower for a designed speed of 41 knots. With accommodations for 3 officers and 14 men, the crew varied from 12 to 14. Its full-load displacement was 56 tons. Early Elco boats had two 20mm guns, four .50-caliber machine guns, and two or four 21-inch torpedo tubes. Some of them carried depth charges or mine racks. Later boats mounted one 40mm gun and four torpedo launching racks. Many boats received ad-hoc refits at advanced bases, mounting such light guns as Army Air Forces 37mm aircraft guns and even Japanese 23mm guns. Some PTs later received rocket launchers.  

The seventh 40-ton Motor Torpedo Boat (MTB) built at Elco, she was laid down 4 March 1942, launched on 20 June, delivered to the Navy on 10 July 1942, and fitted out in the New York Naval Shipyard at Brooklyn. The Elco boats were the largest in size of the three types of PT boats built for U.S. use during World War II. Wooden-hulled, 80 feet long with a 20-foot, 8-inch beam, the Elco PT boats had three 12-cylinder Packard gasoline engines generating a total of 4,500 horsepower for a designed speed of 41 knots. With accommodations for 3 officers and 14 men, the crew varied from 12 to 14. Its full-load displacement was 56 tons. Early Elco boats had two 20mm guns, four .50-caliber machine guns, and two or four 21-inch torpedo tubes. Some of them carried depth charges or mine racks. Later boats mounted one 40mm gun and four torpedo launching racks. Many boats received ad-hoc refits at advanced bases, mounting such light guns as Army Air Forces 37mm aircraft guns and even Japanese 23mm guns. Some PTs later received rocket launchers.  

====Service in the Solomons====

===Service in the Solomons===

PT-109 joined MTB Squadron FIVE and shifted to [[Panama]], replacing the first eight PT boats that sailed on transports for the south Pacific in early September. Six of the Elco boats, PTs 109 through 114, were then transferred to MTB Squadron TWO on 26 October 1942 and prepared for deployment to the [[Solomon Islands]]. The boats were loaded on cargo ships and sailed west, arriving at Sesapi, Tulagi harbor, Nggela Islands, at the end of November. There, the Elco boats joined the earlier boats--which had established the MTB base at Sesapi in October--to form Motor Torpedo Boat Flotilla ONE, under Commander Allen P. Calvert.

PT-109 joined MTB Squadron FIVE and shifted to [[Panama]], replacing the first eight PT boats that sailed on transports for the south Pacific in early September. Six of the Elco boats, PTs 109 through 114, were then transferred to MTB Squadron TWO on 26 October 1942 and prepared for deployment to the [[Solomon Islands]]. The boats were loaded on cargo ships and sailed west, arriving at Sesapi, Tulagi harbor, Nggela Islands, at the end of November. There, the Elco boats joined the earlier boats--which had established the MTB base at Sesapi in October--to form Motor Torpedo Boat Flotilla ONE, under Commander Allen P. Calvert.

On 21 February, the MTBs escorted transports for the invasion of the Russell Islands, with PT-109 personally delivering Col. E. J. Farrel and his staff to the beach in Renard Sound. After the transports landed the remaining Marine and Army troops, the PTs began nightly offshore security patrols to protect the beach head. Additional patrols covered the familiar channels off Savo Island in case the Japanese returned to the Solomons. These operations became more difficult on 5 March, when a single plane dropped four bombs on Senapi, destroying the operations office and riddling the hull of PT-118. Then, on 7 April, the last major Japanese air strike in the Solomons managed to sink three Allied ships in Tulagi harbor and damage two others, temporarily disrupting MTB base operations.

On 21 February, the MTBs escorted transports for the invasion of the Russell Islands, with PT-109 personally delivering Col. E. J. Farrel and his staff to the beach in Renard Sound. After the transports landed the remaining Marine and Army troops, the PTs began nightly offshore security patrols to protect the beach head. Additional patrols covered the familiar channels off Savo Island in case the Japanese returned to the Solomons. These operations became more difficult on 5 March, when a single plane dropped four bombs on Senapi, destroying the operations office and riddling the hull of PT-118. Then, on 7 April, the last major Japanese air strike in the Solomons managed to sink three Allied ships in Tulagi harbor and damage two others, temporarily disrupting MTB base operations.

====PT-109 under Kennedy====

===PT-109 under Kennedy===

In between regular security patrols, PT-109 underwent several short maintenance periods, which included the installation of a surface search radar set. As radar sets were not issued with this class of PT-boats, the device was undoubtedly a "scrounged" item and it is unclear how long it lasted. Ensign Larson left the boat on 20 April 1943 and Ensign Leonard J. Thom, USNR, the executive officer, took charge until relieved by Lieutenant (jg) John Fitzgerald Kennedy, USNR, on the 24th. Starting in late April, the motor torpedo boat increasingly conducted patrols in the Russell Islands area and on 16 June, PT-109 shifted with other boats to a "bush" berth on Rendova Island in support of these forward operations.

In between regular security patrols, PT-109 underwent several short maintenance periods, which included the installation of a surface search radar set. As radar sets were not issued with this class of PT-boats, the device was undoubtedly a "scrounged" item and it is unclear how long it lasted. Ensign Larson left the boat on 20 April 1943 and Ensign Leonard J. Thom, USNR, the executive officer, took charge until relieved by Lieutenant (jg) John Fitzgerald Kennedy, USNR, on the 24th. Starting in late April, the motor torpedo boat increasingly conducted patrols in the Russell Islands area and on 16 June, PT-109 shifted with other boats to a "bush" berth on Rendova Island in support of these forward operations.