== Militær karriere ==
Efter uddannelse som kadet ved [[Royal Military Academy Sandhurst]] blev Wallace i juni 1991 indsat i Scots Guards som sekondløjtnant.<ref>''[[London Gazette|The London Gazette]]'', Issue 52575 (Supplement), 17. juni 1991, [https://www.thegazette.co.uk/London/issue/52575/supplement/9334 p. 9334] {{Webarchive|url=https://web.archive.org/web/20220707135512/https://www.thegazette.co.uk/London/issue/52575/supplement/9334|date=7. juli 2022}}</ref> Fra 1991 til 1998 gjorde han tjenestetjente i [[Tyskland]], [[Cypern]], [[Belize]] og [[Nordirland]].<ref name="Sabbagh" /> I april 1993 blev han forfremmet til løjtnant,<ref>''The London Gazette'', Issue 53278 (Supplement), 19. april 1991, [https://www.thegazette.co.uk/London/issue/53278/supplement/6957 p. 6957] {{Webarchive|url=https://web.archive.org/web/20220402135724/https://www.thegazette.co.uk/London/issue/53278/supplement/6957|date=2. april 2022}}</ref> og senere samme år fik han hædrende omtale<ref>''The London Gazette'', Issue 53453 (Supplement), 13. oktober 1993, [https://www.thegazette.co.uk/London/issue/53453/supplement/16389 p. 16389] {{Webarchive|url=https://web.archive.org/web/20220707135514/https://www.thegazette.co.uk/London/issue/53453/supplement/16389|date=7. juli 2022}}</ref> for en hændelse i [[Belfast]], hvor den patrulje, han kommanderede, fangede en hel IRA Active Service Unit (ASU), der forsøgte at udføre et bombeangreb mod britiske tropper.<ref name="Sabbagh" /><ref name="The Ben Wallace One">{{Cite web|url=https://www.bbc.co.uk/sounds/play/p07ydsw8|title=The Ben Wallace One|access-date=20. december 2019|publisher=BBC|archive-date=20. december 2019|archive-url=https://web.archive.org/web/20191220174203/https://www.bbc.co.uk/sounds/play/p07ydsw8|url-status=live}}</ref> I 1996 blev han forfremmet til kaptajn.<ref>''The London Gazette'', Issue 54500, 19. august 1996, [https://www.thegazette.co.uk/London/issue/54500/page/11141 p. 11141] {{Webarchive|url=https://web.archive.org/web/20220707135438/https://www.thegazette.co.uk/London/issue/54500/page/11141|date=7. juli 2022}}</ref>
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