Why is the army interested in spread spectrum?

[1]  Paul F. Sass,et al.  Army Spread Spectrum - Evolution or Revolution , 1982, MILCOM 1982 - IEEE Military Communications Conference - Progress in Spread Spectrum Communications.

[2]  B. Goldberg.  Applications of statistical communications theory , 1981, IEEE Communications Magazine.

[3]  S.A. Gronemeyer,et al.  Advances in packet radio technology , 1978, Proceedings of the IEEE.

[4]  R. Briskman.  Domestic communications satellites: System considerations for rural areas , 1981, IEEE Communications Magazine.