Ingersoll reported aboard the battleship {{USS|North Dakota|BB-29}} on 8 July 1920 to begin his first tour of duty as a naval officer.[ In 1921, he transferred to the destroyer {{USS|Cassin|DD-43}}.][[https://babel.hathitrust.org/cgi/pt?id=mdp.39015036626391&view=1up&seq=112 Register of the Commissioned and Warrant Officers of the United States Navy and Marine Corps, January 1, 1922, Washington, D.C.: Government Printing Office, 1922, pp. 102–102.]] After Cassin was decommissioned in 1922, he transferred to the destroyer {{USS|Hopkins|DD-249}},[[https://babel.hathitrust.org/cgi/pt?id=mdp.39015036626391&view=1up&seq=548 Register of the Commissioned and Warrant Officers of the United States Navy and Marine Corps, January 1, 1923, Washington, D.C.: Government Printing Office, 1923, pp. 100–101.]] which operated from Constantinople in the waters of the Ottoman Empire during his tour.[{{cite DANFS |url=https://www.history.navy.mil/research/histories/ship-histories/danfs/h/hopkins-iii.html |title=Hopkins III (DD-249) |date=20 July 2015 |accessdate=5 January 2020}}] Promoted to lieutenant (junior grade) on 5 June 1923, he was serving aboard the destroyer {{USS|Sicard|DD-346}} in the United States Asiatic Fleet by the beginning of 1924.[[https://babel.hathitrust.org/cgi/pt?id=mdp.39015036626383&view=1up&seq=139 Register of the Commissioned and Warrant Officers of the United States Navy and Marine Corps, January 1, 1924, Washington, D.C.: Government Printing Office, 1924, pp. 120–121.]] During his tour, Sicard supported the first aerial circumnavigation of the world by four United States Army Air Service Douglas World Cruiser aircraft in 1924.[{{cite DANFS |url=https://www.history.navy.mil/research/histories/ship-histories/danfs/s/sicard.html |title=Sicard (DD-346) |date=3 March 2016 |accessdate=5 January 2020}}] He transferred to the destroyer {{USS|Borie|DD-215}} in 1925.
Detaching from Borie in July 1925,[[https://babel.hathitrust.org/cgi/pt?id=mdp.39015036626375&view=1up&seq=116 Register of the Commissioned and Warrant Officers of the United States Navy and Marine Corps, January 1, 1926, Washington, D.C.: Government Printing Office, 1926, pp. 110–111.]] Ingersoll reported to Naval Air Station Pensacola in Pensacola, Florida, on 1 August 1925 for aviation training.[ He qualified as a naval aviator, was promoted to lieutenant on 1 July 1926, and on 1 September 1926][[https://babel.hathitrust.org/cgi/pt?id=mdp.39015036626375&view=1up&seq=806 Register of the Commissioned and Warrant Officers of the United States Navy and Marine Corps, January 1, 1927, Washington, D.C.: Government Printing Office, 1927, pp. 108–109.]] reported for duty as a pilot with Bombing Squadron 1 (VB-1). Before the end of 1926 he began duty aboard the seaplane tender {{USS|Wright|AV-1}}, and in 1927 he left Wright[ to become a pilot in Torpedo Squadron 1 (VT-1), remaining with the squadron until 1928.][ By the beginning of 1929 he was a pilot in Bombing Squadron One (VB-1B) in the Battle Fleet.][[https://babel.hathitrust.org/cgi/pt?id=mdp.39015036626367&view=1up&seq=658 Register of the Commissioned and Warrant Officers of the United States Navy and Marine Corps, January 1, 1929, Washington, D.C.: Government Printing Office, 1929, pp. 100–101.]] He left the squadron that year to serve aboard the battleship {{USS|Maryland}},[ detaching from her in June 1929.][[https://babel.hathitrust.org/cgi/pt?id=mdp.39015036626359&view=1up&seq=678 Register of the Commissioned and Warrant Officers of the United States Navy and Marine Corps, January 1, 1931, Washington, D.C.: Government Printing Office, 1931, pp. 98–99.]]
Ingersoll reported for duty at Naval Support Activity Hampton Roads at Naval Air Station Norfolk in Norfolk, Virginia, on 28 July 1929.[ On 1 July 1931, he returned to sea, beginning a tour aboard the aircraft carrier {{USS|Langley|CV-1}}.][[https://babel.hathitrust.org/cgi/pt?id=mdp.39015036626342&view=1up&seq=108 Register of the Commissioned and Warrant Officers of the United States Navy and Marine Corps, January 1, 1932, Washington, D.C.: Government Printing Office, 1932, pp. 100–101.]] Detaching from Langley in June 1933, he returned to Naval Air Station Norfolk on 29 June 1933 for another tour there.[[https://babel.hathitrust.org/cgi/pt?id=mdp.39015036626334&view=1up&seq=104 Register of the Commissioned and Warrant Officers of the United States Navy and Marine Corps, January 1, 1934, Washington, D.C.: Government Printing Office, 1934, pp. 94–95.]] He returned to the fleet on 26 July 1935, beginning a tour with Bombing Squadron 5B (VB-5B).[[https://babel.hathitrust.org/cgi/pt?id=mdp.39015036626326&view=1up&seq=80 Register of the Commissioned and Warrant Officers of the United States Navy and Marine Corps, July 1, 1936, Washington, D.C.: Government Printing Office, 1936, pp. 74–75.]] He was promoted to lieutenant commander on 1 July 1936,[ by which time he had completed the Naval War College correspondence course in naval strategy and naval tactics.]
Leaving VB-5B in December 1936, Ingersoll reported on 31 December 1936 for duty in connection with the new aircraft carrier {{USS|Yorktown|CV-5}},[[https://babel.hathitrust.org/cgi/pt?id=mdp.39015036626326&view=1up&seq=780 Register of the Commissioned and Warrant Officers of the United States Navy and Marine Corps, July 1, 1937, Washington, D.C.: Government Printing Office, 1937, pp. 70–71.]] then fitting out at Newport News Shipbuilding and Drydock Company in Newport News, Virginia.[{{cite DANFS |url=https://www.history.navy.mil/research/histories/ship-histories/danfs/y/yorktown-iii.html |title=Yorktown III (CV-5) |date=31 December 2015 |accessdate=5 January 2020}}] He detached from Yorktown prior to her commissioning, and on 30 September 1937 he assumed command of Patrol Squadron 18 (VP-18),[[https://babel.hathitrust.org/cgi/pt?id=mdp.39015036626318&view=1up&seq=76 Register of the Commissioned and Warrant Officers of the United States Navy and Marine Corps, July 1, 1938, Washington, D.C.: Government Printing Office, 1938, pp. 68–69.]] a new squadron established at Naval Air Station Seattle in Seattle, Washington on 1 September 1937. Under his command, the squadron took delivery of its first aircraft, 15 Consolidated P2Y-3 flying boats, on 15 January 1938,[{{cite book | last1 = Roberts | first1 = Michael D. | title = Dictionary of American Naval Aviation Squadrons, Volume 2, Chapter 3, Section 12: Patrol Squadron Histories for 2nd VP-91 to VP-133 | publisher = Naval Historical Center, Department of the Navy | year = 2000 | location = Washington, D.C. | url = http://www.history.navy.mil/avh-vol2/chap3-12.pdf | archive-url = https://web.archive.org/web/20030707184542/http://history.navy.mil/avh-vol2/chap3-12.pdf | url-status = dead | archive-date = July 7, 2003 | pages = 363–365 | access-date = 2014-02-26}}] was redesignated Patrol Squadron 13 (VP-13) on 1 July 1939,[[https://babel.hathitrust.org/cgi/pt?id=mdp.39015036626318&view=1up&seq=808 Register of the Commissioned and Warrant Officers of the United States Navy and Marine Corps, July 1, 1939, Washington, D.C.: Government Printing Office, 1939, pp. 64–65.]] and was redesignated Patrol Squadron 26 (VP-26) on 11 December 1939.[[https://babel.hathitrust.org/cgi/pt?id=mdp.39015036626300&view=1up&seq=72 Register of the Commissioned and Warrant Officers of the United States Navy and Marine Corps, July 1, 1940, Washington, D.C.: Government Printing Office, 1940, pp. 66–67.]]
Ingersoll left the squadron in July 1940[[https://babel.hathitrust.org/cgi/pt?id=mdp.39015036626300&view=1up&seq=856 Register of the Commissioned and Warrant Officers of the United States Navy and Marine Corps, July 1, 1941, Washington, D.C.: Government Printing Office, 1941, pp. 54–55.]] and began a tour with the Bureau of Aeronautics in Washington, D.C.[ Promoted to commander on 1 April 1941.][ he became the assistant naval attache in London 16 April 1941.]