B-21: 7th Problem

SIGNAL SERVICE, WAR DEPARTMENT, WASHINGTON D.C.

January 1935, the 15th,

Dear students,

In the following problem, we only know some probable words:
WASHINGTON, CONTINENTAL, COMMANDER, UNITED STATES

Good Luck !

Frank Rowlett

WHHML WFUBG IYJRM GEHRC MVBFH VIANS FIQEO IPXHP TPWXL HOJJJ
UEYXW VEYYJ IBNJN KAFIV TPGVG CMBOU GQBNS DEMCA BTYDS WDOLW
AHTWJ JYVNQ FGDJH XBSSK XPNYB EJTSL PYOMV OQSWH GVFIV QYCRW
RKSAH YSOWC CNLXF TQHER MMVND FMQSP LSVUJ TKIPJ JXCIB IPOFS
ESDLG WRRRU VKELI KVYDI YEJLI APYQT DANKF HTFTX RJRQC VUAEA
XTLKM THFMP ETPXG ADXXX