The contract will see the firm provide support to certain specialist equipment and includes options covering additional development activities.
The duration of the contract will be between two and six years, with a minimum value of around £0.9m and a maximum value of up to £7.7m.
Andrew Thomis, chief executive of Cohort plc, said: "This is another excellent win for MCL demonstrating its extremely strong capability in this specialist area.
“After many years successfully delivering land based tactical communications, we are pleased to have built on this experience enabling this, our first win in the tactical airborne environment.
"This adds further visibility to our order book, which underpins a significant proportion of revenues for Cohort's current financial year."
MCL will be supported by its partner Serbus Ltd in the delivery of the contract.