As a multinational military unit, the Trinity Task Force draws its recruits from a number of national military forces around the world, selecting volunteers from the rank-and-file. Out of necessity and to assist in the selection process, it is common practice for the unit to request access to a nation's military personnel database; those that do become host nations from which the unit can both recruit and deploy in an operational capacity where needed.

As of September 26, 2040, TTF host nations consist of:
-Argentina
-Australia
-Austria
-Brazil
-Canada
-China
-Croatia
-Czech Republic
-Denmark
-Fiji
-Finland
-France
-Germany
-Hungary
-Iceland
-India
-Israel
-Japan
-Malaysia
-Mexico
-Mongolia
-Netherlands
-New Zealand
-Norway
-Numidia
-Poland
-Portugal
-Russia
-Saudi Arabia
-Singapore
-Slovenia
-South Korea
-Spain
-Sweden
-Turkey
-Ukraine
-United Kingdom
-United States

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