Earlier quoted context omitted.
Locks are often intentionally omitted from equipment in environments where high availability is prioritized. They are also often omitted in locations where physical security is provided at a broader level.
Sure, let's intentionally omit locks from equipment that is designed not to fall into enemy hands. Let's not have a kill switch, either. Sure, makes sense for an agency with more money to spend than every corporation in America!
You might be familiar with locks on vehicles due to your own experiences, but deterrence to unoccupied theft is a requirement that is somewhat unique to civilian passenger vehicles. It is completely normal for many other types of vehicles to have very minimal or zero theft mitigations due to operating in different conditions with different requirements. For example, multi-million dollar jets have no anti-theft systems at all.