As discussed in TC 3-20, Integrated Weapons Training Strategy, individuals and units can lose their proficiency ratings for a number of reasons aside from time.
Elements that successfully complete their CTP and LFPG events lose their proficiency ratings based on a common set of rules. All qualifications, certifications and proficiency ratings within the IWTS are valid unless one of the following condemnation criteria exist:
Time – twelve months have elapsed since the date of the qualification or certification was completed
Key leader turnover – minimum identified key leaders at echelon are no longer assigned to the positions within the small unit.
Commander assessment – the evaluation Commander two levels higher determines the subordinate unit’s proficiency is no longer at a trained level.
Subordinate element proficiency – the minimum number of subordinate elements are no longer proficient.
Specialty proficiency – for units with assigned or attached speciality units (scout platoon, mortar platoon, sniper team) controlled by the Commander, the minimum number of those specialty units fail to maintain their proficiency. This also includes specific specialty certifications or additional skill identifier or qualification skill identifier requirements.
Staff Section proficiency – for organizations with supporting staff sections, the specified minimum number of staff sections are no longer proficient.
US Army TC 3-20, Integrated Weapons Training Strategy, page 1-26
Clearly not all of these criteria apply to individual weapons quals, however the IWTS created rules that Commanders apply based on the size and mission of their formations. Please see the following graphic for more information:
For large units with subordinate elements, the proficiency standards change somewhat:
Please continue on to the following links to better understand each table individually.
The Integrated Weapons Training Strategy Explained 