WGA's "The German Sentries" kit doesn't initially seem like the best candidate to build an army from.
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https://wargamesatlantic.com/collections/all/products/german-sentries
But I found the perfect list for them.
The 325 Sicherungs-Division/Defense of Paris list:
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From the Campaign D-Day US Sector:
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This list and the WGA German Sentries kit really compliment each other.
The Sentry kit has separate gorgets so you can build as many Feldjagerkorps as you want.
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I would mostly use the bodies with low boots and gators to represent these veterans.
I would mostly use the bodies with jack boots to represent the rear echelon "Alert" troops who have been pulling sweet duty in gay Paris for the last 4 years. (Jack boots were far preferred by most German Soldiers and occupation troops would have definitely held onto them).
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Finally the WGA kit lets you build an excellent looking Officer.
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Here is the 500 point list I came up with. This is only using models and options in the kit.
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The keen eyed will note that above is 31 models. To hit 500 points I had to use one dog model who is listed as a Feldjagerkorps member. I think the submachinegun does a good job of representing the dogs close combat capability. I would personally not shoot the dog's SMG in game.
Alternatively stealing 2 or 3 Panzerfausts from a Panzer Lehr kit would make a more well round force and hit 500 points without using a dog mini.
It's an interesting list with weak units and veterans. The Feldjagerkorps "Get Back In The Fight" rule actually creates a decent synergy. The Feldjagerkorps should be able to close and seize objectives. The "Alert" troops might be able to hold down objectives.