Military morse users would predominantly send ciphertext, so the letter distribution would (hopefully) be random. Professional morse users often sent very cond

Military morse users would predominantly send ciphertext, so the letter distribution would (hopefully) be random. Professional morse users often sent very condensed messages using a variety of abbreviated formats. For example, here's an excerpt from an NOAA aviation weather forecast: WA CASCDS WWD CSTL SXNS...SCT025 SCT050. 06Z SCT020 BKN050 TOP 100. OTLK...MVFR CIG. OLYMPICS...BKN-SCT060 TOP 080. ISOL -SHSN. 04Z SKC. 08Z BKN050 OVC150 TOP FL200. OCNL VIS 3-5SM IN SCT -SHSN. OTLK...IFR CIG SHSN.