IARU Monitoring System (IARUMS) Region 1 newsletter says in July, like every month for many years, Over The Horizon Radars were the most numerous transmissions causing interference to our HF amateur radio bands

The front runner was the RUS Contayner (BW = 12K0E; 40 sps), received in all bands from 40 to 12 m. The CHN OTHRs sending short bursts (BW = 10K0E; 41.7, 50, 66.7 and 83.3 sps) were also very active and were mostly observed on the 20 m and 15 m bands.

The International Amateur Radio Union Monitoring System (IARUMS) Region 1 July 2022 newsletter- https://www.iaru-r1.org/wp-content/uploads/2022/08/IARUMS-R1-Newsletter-2022-07.pdf

Recordings of military transmissions can be found on the Signal Identification Guide Wiki - https://www.sigidwiki.com/wiki/Category:Military

Monitor the short wave bands online with a web-based SDR receiver - http://www.websdr.org/

IARU Monitoring System (IARUMS) - https://www.iarums-r1.org/