What marks are associated with the Squirrel helicopter?

The Squirrel helicopter is primarily associated with the designations HT1 and HT2. These markings indicate specific models within the Helicopter Training fleet of the UK's military, emphasizing the helicopter's role in training operations. The HT designation signifies that these helicopters are used for training purposes, which aligns with the Squirrel's operational use in providing pilots with essential flying experience.

Understanding these designations is crucial as they reflect the type of missions and training capabilities a helicopter offers. The HT1 and HT2 are both important for training because they are configured to support various exercises for new pilots, enabling them to develop their skills safely and effectively.

The other choices contain designations that do not correspond to the Squirrel helicopter, as HC2 and HT3 are linked to different helicopter models within the broader fleet employed by the ministry of defence. This distinction is important for understanding the specific roles that different helicopters play within military operations and training environments.