Both seem to have UHF band plans
USA 99
AZIMUTH: 134.8 SE
ELEVATION: 42.6
USA 115 aka Milstar
AZIMUTH: 184.1 S
ELEVATION: 52.5
The Milstar system provides uplink communications at extremely high frequency (EHF), 44 GHz, and ultrahigh frequency (UHF), 300 MHz, and downlink communications at super-high frequency (SHF), 20 GHz, and UHF, 250 MHz. The crosslinks operate in the 60 GHz region. Survivability and endurability requirements are satisfied by anti-jam, hardening and system autonomy features.