Faction + Commander Name: UKF Lend Lease Regiment
Theme: A commander that uses American equipment to fill the holes in the UKF roster. A unit-based commander like USF Mechanized, UKF Lend Lease provides the British Forces with mortars, strong CQC infantry, anti-infantry light vehicles and medium Tank Destroyers, but in turn doesn't have the powerful off-map strikes other doctrines boast.
Unit and Ability Roster
Slot 1: 81mm Mortar Team- Call in unit, available from 0CP.
Same as the USF unit, but with a UKF weapon crew.
Slot 2: Royal Engineer Assault Package- Slot upgrade, available from 1CP.
Grants the Royal Engineer squad two Thompson SMGs.
Mutually exclusive with the minesweeper and Heavy Engineer upgrade. Uses both weapon slots.
Allows Sappers to scale as close combat troops at the cost of versatility.
Slot 3: M3 Resupply Halftrack
- Call in unit, available from 4CP.
The same ability as Special Weapons Regiment.
Slot 4: M5 "Honey" Stuart Light Tank
- Call in unit, available from 4CP.
A variant of the Stuart tailored towards anti-infantry combat, providing an anti-infantry shock vehicle and later on a good team weapon killer.
Has the Canister Shot and Smoke Shells ability.
Slot 5: M10 Tank Destroyer.
- Buildable from T3.
Pretty much the same as the USF unit.
Fills the medium tank destroyer role UKF lacks.
Strategies and Rationale
The Lend Lease Regiment follows a similar philosophy to USF's Mechanized Doctrine: it gives UKF a lot of unit options to play with and fills some holes in their roster, but doesn't add any of the more powerful doctrinal toys like skillplanes or heavy artillery strikes. It's meant to be an option, not an automatic pick you can't go without.
Sapper Assault Package makes Sappers into strong CQC infantry (we're talking Cav Rifles, not Shocks) rather than slightly better Pios. However, it eats all their weapon slots and locks out their upgrades, so an Assault Sapper won't be a jack-of-all-trades utility squad.
The M10 is both a good historical fit (the British Army had a lot of them and stuck 17 pounders on a few) and fills a big hole in the UKF roster: their next AT step up from the Cromwell is the Firefly, which is very fragile and geared towards killing big tanks. The M10, a speedy AT brawler, is a very useful unit for UKF to have access to. Of all the units in this doctrine, the M10 is the one I'd most want to give to UKF.
The Stuart is another US vehicle the British used a lot of. Using the Stuart as it is in USF would be redundant with the AEC, so the UKF one is reworked to be more like its CoH 1 incarnation: a T-70 like generalist light tank with Canister Shot. An anti-infantry light vehicle is something UKF doesn't have, and it synergises with the cheap M10 to defend it from later medium armor.
The existing Resupply Halftrack is already a US unit, so it's an obvious ability to include. It also provides the doctrine with a munitions sink: with no heavy off-maps there are a lot of munitions to spend on Thompson Sappers and double Vickers infantry sections.
Additional Context
The Stuart, M10 and Thompson Submachine Gun were all used extensively by British Forces. The Stuart was a British unit in COH 1, and some M10s (although not the one in this commander!) were fitted with 17 pounders like the Firefly.
The M10 idea is shamelessly stolen from other proposals because it's such a good idea. Credit to A. Soldier for that one.