Thanks to Graver # 48541445 for links to parents and middle name.

Father: Richard M Hoban b.1888 MO
Mother: Virginia E Hallissey (Haney) b.1890 MO
***Found a draft registration for Richard Matthew Hoban b.03/31/1887 Mexico, MO
https://familysearch.org/ark:/61903/3:1:33S7-L14X-BL8?mode=g&i=2878&cc=1968530

JCS 20 Jan 1993 states William was a Major U S Air Force WWII

William's enlistment record shows his civilian occupation as:
Semiskilled heat treaters, annealers, and temperers

It also shows that on 08/11/1942 he was a Private in the Army Air Corps.
Army Component: Reserves - exclusive of Regular Army Reserve and Officers of the Officers Reserve Corps on active duty under the Thomason Act (Officers and Enlisted Men -- O.R.C. and E.R.C., and Nurses-Reserve Status)
William's separation notice is dated 01/21/1946 from the Jefferson Barracks, St. Louis, Missouri, United States and he was married at the time.
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Richard M Hoban / United States Census, 1900
Name Richard M Hoban
Event Place Butte city Ward 5, Silver Bow, Montana
Gender Male
Age 13
Marital Status Single
Race White
Relationship to Head of Household Son
Birth Date Mar 1887
Birthplace Missouri
Father's Birthplace Ireland
Mother's Birthplace Ireland

Household Role Sex Age Birthplace
Mary Hoban Head F 41 Ireland
Jas J Hoban Son M 15 Missouri
Richard M Hoban Son M 13 Missouri
Richard Hoban Lodger M 54 Ireland
Albert Stack Lodger M 27 New York
Margarite Hogan Lodger F 29 Missouri
Edward Walsh Lodger M 24 Illinois
Alfred F Williams Lodger M 31 Kansas
James Mcpike Lodger M 28 New York
John Hoban Lodger M 13 Missouri
Peter H Johnson Lodger M 33 Nevada
Charles Kerr Lodger M 26 Illinois
*****Note on Jas J--James John Hoban b.07/30/1885
Married Ruby Davis b.1883 IN -- WWI registration dated 09/12/1918 has, medium height,medium build,blue eyes,light hair and a birth mark over right eye. He was a claims adjuster for W.S.R.A. MO Pacific
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Richard Hoban / United States Census, 1910
Name Richard Hoban
Event Place East St Louis Ward 7, St Clair, Illinois,
Gender Male
Age 23
Marital Status Single
Race White
Relationship to Head of Household Son
Birth Year (Estimated) 1887
Birthplace Missouri
Father's Birthplace Ireland
Mother's Birthplace Ireland

Household Role Sex Age Birthplace
Mary Hoban Head F 48 Ireland
James Hoban Son M 24 Missouri
Richard Hoban Son M 23 Missouri

William Hoban / United States Census, 1920
Name William Hoban
Event Place St Louis Ward 2, St Louis (Independent City), Missouri
Gender Male
Age 3
Marital Status Single
Race White
Relationship to Head of Household Son
Birth Year (Estimated) 1917
Birthplace Missouri
Father's Birthplace Missouri
Mother's Birthplace Missouri

Household Role Sex Age Birthplace
Elizabeth Hancy Head F 53 Missouri
Dan Hancy Son M 31 Missouri
Ruth Hancy Daughter F 19 Missouri
Richard Hoban Son-in-law M 32 Missouri
Virginia Hoban Daughter F 30 Missouri
William Hoban Son M 3 Missouri
James Oneil Brother M 65 Ireland
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William Hoban / United States Census, 1930
Name William Hoban
Event Place St Louis (Districts 251-500), St Louis (Independent City), Missouri, United States
Gender Male
Age 13
Marital Status Single
Race White
Relationship to Head of Household Son
Birth Year (Estimated) 1917
Birthplace Missouri
Father's Birthplace Missouri
Mother's Birthplace Missouri

Household Role Sex Age Birthplace
Richard Hoban Head M 43 Missouri
Virginia Hoban Wife F 38 Missouri
William Hoban Son M 13 Missouri
Richard Hoban Son M 8 Missouri
Mary E Hoban Daughter F 5 Missouri
Mary Hoban Mother F 67 Irish Free State
Elizabeth Haney Mother-in-law F 65 Missouri
James O'Neill Uncle M 74 Missouri
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Wm Hoban / United States Census, 1940
Name Wm Hoban
Event Place Ward 2, St. Louis, St. Louis City, St. Louis City, Missouri, United States
Gender Male
Age 23
Marital Status Single
Race White
Relationship to Head of Household Lodger
Birthplace Missouri
Birth Year (Estimated) 1917
Last Place of Residence Same Place

Household Role Sex Age Birthplace
Wm H Rice Head M 56 Missouri
Minny Rice Wife F 49 Missouri
Virginia H Rice Daughter F 27 Missouri
Bernice M Rice Daughter F 23 Missouri
John L Rice Son M 20 Missouri
Jane C Rice Daughter F 18 Missouri
Thomas Rice Son M 15 Missouri
Wm Hoban Lodger M 23 Missouri
****Note:
William was lodging with his future wife's parents. Probably how they met.