The Ministry of Defence has awarded BT a £21m contract to manage the department's e-learning programme.
More than 300,000 MoD employees, including armed forces personnel, will have access to the ministry's courses.
The MoD's training and education directorate has populated the web-based application with six courses, which range in length from two hours to 18 months. Another 80 courses will be added to the application as the system is rolled out, said the MoD.
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BT's offering includes a learning management system that enables the MoD to restrict access to "protectively marked" courses.
Although unclassified courses may be accessed from non-MoD devices, protectively marked courses are only accessible by users with a log in, a password and individual authorisation to access each course.
Iain Harrison, technology-based training support manager at the MoD, said, "When we establish a user, we are able to check their service and staff number and who they are."