I just got recently into the F-5 / BCM campaign and had the same issue.
Here's the explanation:
TACAN / VOR is referenced to Magnetic North.
The (F10) Navigation Map, NTTR Chart (as well as almost all Checkerboard Streets in the US going N-S or E-W) are oriented in respect to TRUE North.
The difference is called 'Magnetic Variation', and is in the area north of Las Vegas around 14° East.
(Mag. Northpole of the earth does not coincide with geographical Northpole)
That means that any True Heading (e.g. 090°) converts to a
Magnetic Heading by subtracting 14 (e.g. 076°).
Thats why your LSV Radial 025 (mag) reads 039 (true) in the Chart.
Unfortunately, the Voiceovers in the NTTR Familiarization-Mission where your Flight Lead instructs you HEADINGS to fly are also referenced to TRUE North, which makes things a little confusing (you also have to subtract 14° to get your Steering Heading for your CDI).
I hope that helps,
Slade