Final answer:
The information provided does not directly address the minimum length of assignment for shore-based Navy squadron personnel to the supporting IMA/FRC. It instead discusses increased annual drill requirements for the Army due to operational demands.
Step-by-step explanation:
The original question pertains to the assignment duration for personnel in shore-based Navy squadrons with Intermediate-level (I-level) billets to the supporting Intermediate Maintenance Activity (IMA) or Fleet Readiness Center (FRC). However, the information provided does not directly answer the question regarding the specific minimum assignment duration for such billets.
The provided information instead discusses the changes in annual drill requirements for the Army, which increased from the traditional "One weekend a month, two weeks a year" to potentially up to seven weeks per year. This shift was in response to the heavy utilization of National Guard and Reserve components during the Iraq and Afghanistan operations, particularly noting the significant portion of mobilized personnel during the wars. While it highlights the increased demands on reservists, it does not specify the length of assignment for Navy squadron personnel at IMA/FRC.