Both the 141st, a regular Imperial Navy fleet, and a locally raised subsector fleet would consists predominantly of TL-15 combatants. The 141st because the Imperial Navy gets its ships built anywhere and a subsector fleet because it can get its ships built at any shipyard in the subsector, including Theron (0937 A100979-F). (Auxiliaries like tankers and transport ships could be built at lower TLs, provided there was shipyard capacity to build them.)
You are correct. You make an excellent point. I am glad you pointed this out. I am sorry for my mistake. Can we find me a colonial fleet to monkey with? I will withdraw this tinkering. There must be a backwater nock or crany where a few old warhorses might still graze...
- - Ron