In some fanfictions, they might use a time - traveling device created by a brilliant scientist. Maybe it's a modified version of a Stark - like technology that creates a time - warp portal.
There's a fanfic that sends the Howling Commandos back to the time of the dinosaurs. It's a wild ride as they try to survive in a prehistoric world. The author does a great job of describing the dinosaurs and the challenges the team faces. It's not just about the action, but also about how they use their military skills in an entirely new context.
I think Gabe Jones is a standout. In many of the time travel fanfictions, he uses his skills in unique ways. For example, in one where they travel to a world of magic, he manages to adapt his combat skills to deal with magical threats. His adaptability makes him a great character in these stories.
They could face technological challenges. The future's technology might be so advanced that they can't understand or operate it, like flying cars or energy shields.
The Howling Commandos often add an element of nostalgia and historical depth. They might be brought into the present or future through time travel to assist the Avengers in some way.
They might be amused. The fanfiction world can come up with some wild and creative ideas about Captain America, and the Howling Commandos would probably get a kick out of seeing these unique interpretations.