I'm not sure specifically, but it could be the harvesters themselves. There might be an experienced old - timer who has been in the business for decades and knows all the tricks of the trade.
One of the main themes could be the struggle of the American harvesters. It might show their hard work in the fields, dealing with the elements and the challenges of farming life.
The appeal lies in the novelty. It's not a common pairing we see in mainstream fiction. So it offers a fresh take on relationships in a fictional context.
I find that in 'harvester queen x human fanfic', the contrast between the two characters is what makes it appealing. The harvester queen might have powers and a way of life that are completely foreign to the human. This can lead to all sorts of storylines, from the human trying to understand the harvester queen's world, to them falling in love despite their differences.
During the Cold War, there were a plethora of activities happening on both sides. If this 'Russian harvester attack' was a real event, it could potentially be related to the use of machinery or equipment in a military - like operation. For example, a harvester could be modified or used in a covert way for things like transportation of goods or personnel in a rural area, or it could be part of a psychological warfare tactic where the appearance of a normal harvester was used to deceive the enemy. But again, without more information, this is all just guesswork.
The International Harvester Company played a significant role in World War 2. It produced a variety of military - related equipment. For example, they manufactured trucks that were crucial for transporting troops and supplies. Their manufacturing capabilities were redirected towards the war effort, helping to meet the high demands of the military.
I'm not sure about the specific 'the harvester game story'. It could be about a harvester in a farming context, like a person using a harvester to gather crops and facing various challenges during the harvest season.
The uniqueness of their relationship. Tam and Sheldon are both very different characters. Sheldon is extremely intelligent but socially awkward, while Tam has his own set of qualities. Fanfictions that explore how they interact and complement each other are special. For example, Tam could help Sheldon in social situations that he struggles with, like understanding group dynamics at school.